Question

use the value of the trigonometric function to evaluate the idicated functions:

sin(t)=(4/5)

a) sin(pi-t)
b) sin(t+pi)

how do you do this??

Answer 1

a)sin pi cos t - cos pi sin t
b) sin t cos pi + sin pi cos t

Answer 2

where did the cos come from? sorry but i REALLY dont understand this

Answer 3

thats the formula for compound angle