Use one of the identities

Question

cos(t + 2ðk) = cos t or sin(t + 2ðk) = sin t to evaluate each expression. (Enter your answers in exact form.)
(a)
sin(17ð/4)



(b)
sin(−17ð/4)



(c)
cos(17ð)



(d)
cos(45ð/4)



(e)
tan(−3ð/4)



(f)
cos(7ð/4)



(g)
sec(ð/6+2ð)



(h)
csc(2ð −ð/3)

Answer 1

look how I answered Kaleen's similar question

http://www.jiskha.com/display.cgi?id=1331432278