Establish the identity. 2 cos a- sin "a= a-1 2 2 cos? Using the identity sin a+ cos a= 1, make the appropriate substitution. Which of the following s'a3D O A. cos a- (1- cos a) = 2 cos? a- 1 2 cos 2 a- 1 = 2 cos a-1 %3D α-1 O B. 2 (1 2 )

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A: If you like the solution then please give it a thumbs up... The Answer is:           Explanation:

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A: Here I am attaching image so that you understand each and every step.

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