# Trigonometry

Write the expression as a trigonometric function of only θ, and use a graphing utility to confirm your answer graphically.
cos((9π/2)-θ

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asked by Thomas
1. 9π/2 is the same angle as π/2 (since 9π/2 = π/2+4π)
we all know that the co- in cosine means "complementary angle" so
cos(π/2-θ) = sinθ

Or, you can use the difference of angles formula. Same result.

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posted by oobleck

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