SOLUTION: Simplify the following:
sin (90° + x) sin (180° + x) + cos (90° + x) cos (180° – x)
Algebra.Com
Question 476923: Simplify the following:
sin (90° + x) sin (180° + x) + cos (90° + x) cos (180° – x)
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
==>sin (90° + x) sin (180° + x) + cos (90° + x) cos (180° – x) =
cosx*-sinx + -sinx*-cosx = -sinx*cosx + sinx*cosx = 0.
RELATED QUESTIONS
simplify the following to a single trigonometry term
1. cos 10 . cos 340 - sin 190 .... (answered by MaxWong)
please help me solve my homework: simplify: sin(90degrees+ x) sin ( 180 degrees +x) + cos (answered by stanbon)
if sin x= 4/5, where 0 (answered by edjones)
if cscx=3, 90 < x < 180,
then
sin (x/2)=
cos(x/2)=... (answered by Alan3354)
3.2 Simplify the following expressions to a single trigonometric function, without the... (answered by Edwin McCravy)
Sin(90-x)tan(360-x) divide by... (answered by Theo)
prove that:... (answered by Alan3354)
if sin x= 8/17, where 0 degree < x < 90 degree, determne the exact vaule of cos (x +... (answered by stanbon)
If csc x = 4, 90 < x < 180 , then
sin(x/2)=
cos(x/2)=... (answered by Alan3354)