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Question

If α and β are two different values θ lying between 0 and 2π which satisfy the equation 6cosθ+8sinθ=9. Find sin(α+β).

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Solution


6cosθ+8sinθ=9

6cosθ=98sinθ

squaring.

36cos2θ=81+64sin2θ144sinθ

36(1sin2θ)=81144sinθ+64sin2θ

100sin2θ144sinθ+45=0

α&βarediffValuesofθ

thenproductofroots=sinαsinβ=45100

920

Again8sinθ=96cosθ

64sin2θ=81+36cos2θ108cosθ

100cos2θ108cosθ+17=0

productofroots=cosαcosβ=17100

Nowcosαcosβsinαsinβ=1710045100

cos(α+β)=725

sin(α+β)=2425


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