find DERIVATIVE of sin(-x)....
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Answer:
THE DERIVATIVE of sin x is cos x. To prove that, we will use the following identity: sin A − sin B = 2 cos ½(A + B) sin ½(A − B).
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THE DERIVATIVE of sin x is cos x
sin A − sin B = 2 cos ½(A + B) sin ½(A − B).
The answer is, with the chain rule:
y
'
=
cos
(
−
x
)
⋅
(
−
1
)
=
−
cos
(
−
x
)
.
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