Question

for questions 1-5 decide whether the equation is a trigonometry identical. explain your response.

1. cos^2 x(1+tan^2 x)=1



2. sec x tan x(1-sin^2 x)=sin x


3. csc x(2sin x -sqrt 2)=0


4. cos^2(2x)-sin^2(2x)=0

5. sin^2 theta csc^2 theta=sin^2theta+cos^2 theta