Prove : sin theta sin (90^∘ - theta) - cos theta cos (90^∘ - theta) = 0.
Solved 1. Use the Euler's formula to show that I. cos(-x) = | Chegg.com
Solve the equations cos mtheta = sin ntheta .
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trigonometry - Why is $\cos(-x)$ always $\cos(x)$? - Mathematics Stack Exchange
