## Question

###### (Using ' double-angle or half-angle tormula t0 simplfy the glven expressions (a) If cos? (370 sin? (370 cos( A"), then degrees (b) If cos - (2c) gin- '(22) cos(B), then B =

(Using ' double-angle or half-angle tormula t0 simplfy the glven expressions (a) If cos? (370 sin? (370 cos( A"), then degrees (b) If cos - (2c) gin- '(22) cos(B), then B =

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