cos cot = cos sin csc = 1 sin sec = 1 cos pythagorean identities: sin2 + cos2 = 1 tan2 + 1 = sec2 cot2 + 1 = csc2 even/odd identities: cos( ) = cos sec( ) = sec.

long screws will not break through or visually damage the exposed wood or drywall behind or to the side of the frame. Slightly angle long screws towards the.