Question

Find sin x/2, cos x/2, and tan x/2 from the given information.
cos x = −15/17, 180° < x < 270°

sin x/2=

cos x/2=

tan x/2=

Answer 1

we need to solve for x, from the given equation:
cos x = −15/17, 180° < x < 270°

we can solve for x by doing arccos(-15/17) sound familiar?
once x is found, the rest of the questions will be easy ^_^ make sense?