Question: 7. Prove that (a) (1 + cos A)(1- cos A)(1+ cot2 A) = 1 (b) (1 + tan? 0) sin 0-cos 0 = tan

7. Prove that (a) (1 + cos A)(1- cos A)(1+ cot2 A)

7. Prove that (a) (1 + cos A)(1- cos A)(1+ cot2 A) = 1 (b) (1 + tan? 0) sin 0-cos 0 = tan 6

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