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11. Verify the identity cosx csc? x = csc? x – sinº x– 2. 12. Verify the identity (cos (x + y)][cos (x - y)] = cosx – sin? y.

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* To verify: Costx cosecu = cosec ² x + sin²n - 2 consider LHS. cos 4x Cosec2x = (cos²x2 cosec2x = (1-sin 2) 2 cosec? = (1-211. verified Hence SHO huis-keson = huis ne sont heurs - he nisk, son reson = (ason 1) he nis - (he his-11 & Son = huis & MIS

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