é equivalente a:
a) 2cos x
b) cos x
c) sen x + cos x
d) sen x - cos x
e) cos x - sen x
sen pi/2*cos x + sen x*cos pi/2 + cos 3pi/2*cos x + sen 3pi2*
sen x =
= 1*cos x + 0*sen x + 0*cos x - 1*sen x =
= cos x - sen x.
---Alternativa e.
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sen pi/2*cos x + sen x*cos pi/2 + cos 3pi/2*cos x + sen 3pi2*
sen x =
= 1*cos x + 0*sen x + 0*cos x - 1*sen x =
= cos x - sen x.
---Alternativa e.