What is 564.2 - 39.83?

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

Lines p and q intersect. find the value of b. show your work. cite any theorems you use.

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b