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3. Prove the following identitie. sin 2x = 2 csc 2x - tan x 1 - cos 2x 4. Write 8 cos' x in the
3. Prove the following identitie. sin 2x = 2 csc 2x - tan x 1 - cos 2x 4. Write 8 cos' x in the form a cos 4x + bcos 2x + c. Determine a, b and c
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