Geometry

Fundamental Trigonometric Identities

Trigonometric Co-Function Identities

         

Which of the following is equal to

cot(90θ)? \cot ( 90 ^ \circ - \theta) ?

Given that tanN=1tan30 \tan N ^ \circ = \frac { 1} { \tan 30 ^\circ} , where 0N<180 0 \leq N < 180 , what is the value of NN?

Which of the following is the same as sin(769)?\sin (-769^{\circ})?

In the above graph, a=(0,7)a=(0, 7) and b=(12,0).b=(-12, 0). What is the value of cos(θ)+sin(180θ)?\cos(-\theta)+\sin(180^{\circ} - \theta)?

Which of the following is equal to

cos(π22θ)? \cos \left( \frac{\pi}{2} -2 \theta \right)?

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