Q17 of 113 Page 547

If, where

, find the values of


(i) sin (x + y)


(ii) cos (x + y)


(iii) tan (x – y)


,

Here we will find values of cosx and cosy




(i) sin(x + y) = sinx.cosy + cosx.siny



(ii)cos(x + y) = cosx.cosy + sinx.siny



(iii)Here first we will calculate value of tanx and tany,




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15

If x and y are acute such that , prove that

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If x and y are acute angles such that , prove that .

 18

If , where , find the values of

(i) sin (x + y)


(ii) cos (x – y)


(iii) tan (x + y)


 19

Prove that

(i)


(ii)


(iii)


(iv)