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Pythagorean identities
1+ cot²theta = csc²theta
1+tan²theta=sec²theta
The odd pythagorean identities
sin(-theta)=-sin theta
tan(-theta)=- tan theta
csc(-theta)=-csc theta
cot(-theta)=-cot theta
The even pythagoren identities
cos (-theta) = cos theta
sec(-theta) = sex theta
what is the function that you should memorize?
cos²(theta)-sin²(theta)
sin (alpha +- beta)
cos (alpha +- beta)
sin(alpha)cos(beta) +- cos(alpha)sin(beta)
cos(alpha)cos(beta)-+sin(alpha)sin(beta)
