SOLUTION: Using a sum or difference identity, write the following as an expression involving functions of x. sin(x- pie/2) A) sin x B) sqrt2/2cosx- sqrt2/2 sinx C)-cosx D)sqrt2/2

Question 962780: Using a sum or difference identity, write the following as an expression involving functions of x.
sin(x- pie/2)
A) sin x
B) sqrt2/2cosx- sqrt2/2 sinx
C)-cosx
D)sqrt2/2 cosx+ sqrt2/2 sinx
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
Using a sum or difference identity, write the following as an expression involving functions of x.
sin(x- pie/2)
A) sin x
B) sqrt2/2cosx- sqrt2/2 sinx
C)-cosx
D)sqrt2/2 cosx+ sqrt2/2 sinx
***
sin(x-π/2)=sinxcos(π/2)-cosxsin(π/2)
=sinx*0-cosx*1=-cosx
ans: C)
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