All identities I need:

Sin"2x + cos"2x = 1

1 + tan"2x = sec"2x

1 + cot"2x = cosec"2x

sin(a+/-b) = sinacosb +/- cosasinb

cos(a+/-b) = cosacosb -/+ sinasinb

tan(a+/-b) =

sin2x = 2sinxcosx

=

cos2x = cos"2x - sin"2x

= 2cos"2x - 1

= 1 - 2sin"2x

=

tan2x =

cot2x =

sin3x = 3sinx - 4sin"3x

cos3x = 4cos"3x - 3cosx

tan3x =

cot3x

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