30 random questions |30 minutes | Questions are randomized every attempt. Good luck!
SAT Math - Trigonometry Practice Test
Test your SAT Math - Trigonometry skills with 30 random practice test questions. Great for students preparing for the SAT Math - Trigonometry section!
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1. What is sin(−270°)?
[M] sin(−270°) = −sin(270°) = −(−1) = 1.
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2. For y = 6sin(x/2), the amplitude and period are:
[M] A=6, period=2π/(1/2)=4π.
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3. In a right triangle with angle 60° and adjacent=4, opposite side=
[M] opp=4×tan60°=4√3.
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4. The maximum value of |a·sinθ+b·cosθ| for all θ is:
[VH] max=√(a²+b²) by Cauchy-Schwarz or amplitude formula.
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5. The adjacent side of a 45-45-90 triangle is 7. The hypotenuse is:
[M] hyp=7√2.
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6. The range of y=arctan(x) is:
[H] arctan range is open interval (−π/2,π/2).
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7. What is the exact value of cos(36°)?
[H] cos36°=(√5+1)/4. Wait: cos36°=(1+√5)/4. Actually cos36°=(√5+1)/4 is not exact. Exact: cos36°=(1+√5)/4. This is a known exact value.
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8. The graph y = −sin(x) is the graph of y = sin(x) reflected over the:
[M] Negating the output reflects over x-axis.
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9. What is sin(−π/3)?
[M] sin is odd: −sin(π/3) = −√3/2.
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10. What is tan(0°)?
[M] tan0°=sin0°/cos0°=0/1=0.
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11. For f(x)=arcsin(x), the derivative is 1/√(1−x²). At x=1/2, the slope of tangent to arcsin is:
[VH] 1/√(1−1/4)=1/√(3/4)=2/√3=2√3/3. Both A and C equivalent.
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12. What is sec(60°)?
[M] sec=1/cos. cos60°=1/2. sec=2.
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13. For the equation k·sinθ+3cosθ=5, this has solutions when:
[H] For solutions: √(k²+9)≥5. k²+9≥25. k²≥16. All three equivalent.
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14. What is the period of y=tan(x)?
[M] Period of tan is π.
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15. What is the value of sin(π/2)?
[M] sin(π/2)=sin90°=1.
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16. The Fourier series of f(x)=x on [−π,π] starts with: f(x)=2(sinx − sin2x/2 + sin3x/3 − ...). The coefficient of sin(nx) is:
[VH] Fourier coefficients: bₙ = (2/π)∫₀^π x sin(nx) dx = 2(−1)^(n+1)/n.
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17. What is sin(3π/4)?
[H] 3π/4=135°. Q2,ref=45°. sin positive. sin=√2/2.
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18. The identity sin A + sin B + sin C = 4cos(A/2)cos(B/2)cos(C/2) holds when:
[VH] This is a known identity for angles of a triangle (A+B+C=π).
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19. What is cos(−π/2)?
[M] cos even: cos(π/2) = 0.
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20. The number of complete cycles of y = sin(3x) in [0, 2π] is:
[M] Period=2π/3. Cycles in [0,2π] = 2π/(2π/3)=3.
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21. For the general sine function y=Asin(Bx+C)+D, which parameter affects the midline?
[H] D is the vertical shift, determining the midline y=D.
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22. Solve: arcsin(x)+arccos(x)=π/3
[VH] arcsin(x)+arccos(x)=π/2 for all x∈[−1,1]. Since π/2≠π/3, no solution exists.
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23. The graph y=cos(x) shifted up 3 has equation:
[M] Vertical shift up 3: add 3 to output.
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24. What is sin(45°)?
[M] sin45°=√2/2.
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25. For the Chebyshev polynomial T₅(x) = cos(5·arccos x), expanded:
[VH] T₅(x)=16x⁵−20x³+5x.
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26. In triangle ABC, a=6, b=8, c=9. Which angle is largest?
[H] Largest angle opposite largest side. c=9 is largest. Angle C is largest.
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27. What is sin(315°)?
[M] Q4, ref=45°. sin negative = −√2/2.
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28. For a triangle with sides a=b (isosceles) and vertex angle C, the base angles A=B=(π−C)/2. Area=
[VH] Area=½a²sinC. All three forms are equivalent.
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29. In triangle ABC: A=45°, B=60°, a=5. By law of sines, b =
[M] b = 5sin60°/sin45° = 5√6/2.
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30. Solve: 4cos²x−3=0 for x in [0,2π)
[H] cos²x=3/4. cosx=±√3/2. x=π/6,5π/6,7π/6,11π/6.
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