Question

HOLD ON !

Answer 1

Is this correct ?
\[F~~~~[~~(90n)+x~~~~~~~]=F(x)\]
Where "F" can be sine, cosine, or any other trigonometric function, and and angle x that is a ± multiple of 15.
And for any interger n ?

Answer 2

I mean
\[\tan(185+15)=\tan15\]\[sine(330)=\sin(-30)\]and so on....