Question

if sin(x-pi/2)=.45 find cos(-x) would it just be -.45?

Answer 1

cos(-x) = cos(x)


cos(-x) = sin(pi/2 - x)


cos(-x) = sin(-1(-pi/2 + x))


cos(-x) = sin(-1(x - pi/2))


cos(-x) = -sin(x - pi/2)


cos(-x) = -(0.45)


cos(-x) = -0.45


So you are correct. Nice work.

Answer 2

@jim_thompson5910 really yay

Answer 3

yes, you nailed it kkayla

Answer 4

@jim_thompson5910 :)