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Show that `sin^(-1)(3/5)-sin^(-1)(8/17)=cos^(-1)(84/85)` |
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Answer» `sin^(-1)(3/5)=x and sin^(-1)(8/17)=y` `3/5=sinx and 8/17=siny` cosx=4/5 and cosy=15/17 cos(x-y)=cosxcosy+sinxsiny =`(4/5)(15/17)+(3/5)(8/17)` cos(x-y)=84/85 `x-y=cos^(-1)(84/85)` `sin^(-1)(3/5)-sin^(-1)(8/17)=cos^(-1)(84/85)` Hence proved |
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