(sin(x)) = cos(x)

Alternate notation

sin'(u) = cos(u)u'

D(sin(u)) = cos(u)D(u)

dsin(u) = cos(x)du

(cos(x)) = -sin(x)

Alternate notation

cos'(u) = -sin(u)u'

D(cos(u)) = -sin(u)D(u)

dcos(u) = -sin(x)du

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