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If costheta= x/sqrt(x^2+y^2) show that ...

If ` costheta= x/sqrt(x^2+y^2)` show that `x sin theta = y cos theta`.

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If costheta=(x)/(sqrt(x^(2)+y^(2))) , then show that x sin theta=y cos theta.

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UNITED BOOK HOUSE-JHOWDANGA SAMMILANI HIGH SCHOOL-EXERCISE
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  11. If costheta= x/sqrt(x^2+y^2) show that x sin theta = y cos theta.

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