Which if the following is a consequence of the identity sin 2x=2(sin x)(cos x ) ?
a. sin y = (sin 1/2y)
b. sin 3y= 3( sin 2y)(cos y)
c. sin 4y= 2( sin 2y) ( cos 2y)
d. sin 4y= 4 ( sin 2y) ( cos 2y)
e. sin 8y= 2 ( sin 4y) (cos 2y)

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