trigonometry
posted by anon on .
can you correct the rest for me please?
Express each as a function of theta:
a. sin (270deg + theta)= cos theta
b. cos (pi + theta)= cos theta
c. tan (810 + theta)= ?????
d. sin (theta  180)= sin theta

a) I get cos theta
b) cos theta yes
c) 810 = 360*2 + 90
so really tan (90+theta) =cotan (theta)
d) sin theta is correct