Math C30
posted by Don .
Eight Fundamental Identities
Sec thada  Cos thada on one side
tan thada sin thada on the other side
How do you do this ???

http://greece.mrdonn.org/alphabet.html Impress your teacher, use the right symbols and spelling.
SecThetacosTheta=TanThetaSinTheta
Your teacher is just too easy.
multiply each side by cosTheta
1cos^2 Theta=sin^2 Theta
sin^2 Theta=sin^2 Theta