alleryStart learning →Which of these is the correct value of sin(3π/2 − θ)?
Asinθ
B−sinθ
C−cosθ
Dcosθ
Answer & Solution
Correct answer: C. −cosθ
Sine is negative in the third quadrant and a 3π/2 shift swaps sine with cosine, so sin(3π/2 − θ) = −cosθ.
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