Question

formula for cos2alpha​

Answer 1

Step-by-step explanation:

$\cos(2 \alpha ) = { \cos( \alpha ) }^{2} - { \sin( \alpha ) }^{2} = 1 - 2 { \sin( \alpha ) }^{2} = 2 { \cos( \alpha ) }^{2} - 1$

Answer 2

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