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State which of the following statement i...

State which of the following statement is not true?

A

`4 cos^(3) A = 3 cos 3 A + cos A`

B

The formula of cos 3 A can be deduced from the formula`sin3 A = 3 sin A - 4 sin^(3)A "replacing" A by (90^(@) -A)`

C

`cos 2 theta = 2 sin ( pi/4 + theta) cos (pi/4 + theta)`

D

The formula of `sin 2 theta` can be obtained replacing `theta "by" (pi/4 + theta) " in the formula" cos 2 theta = 2 cos^(2) theta-1`

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The correct Answer is:
A
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