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Prove that (i)" sin" 80^(@)"cos" 20^(@) - " cos"80^(@) " sin " 20^(@)=(sqrt(3))/(2) (ii)"cos " 45^(@)" cos"15^(@)-" sin" 45^(@)" sin "15^(@) = (1)/(2) (iii)" cos" 75^(@)" cos"15^(@)+ " sin"75^(@)" sin" 15^(2)= (1)/(2) (iv)"sin" 40^(@)" cos" 20^(@) " + cos" 40^(@)" sin " 20^(@)=(sqrt(3))/(2) (v) " cos"130^(@)" cos" 40^(@) l + " sin"130^(@) " sin" 40^(@) =0 |
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