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सिद्ध कीजिए कि `3sintheta-sin 3 theta=(4sin theta)/(1+cot^(2)theta)`

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सिद्ध कीजिए कि
`3sintheta-sin 3 theta=(4sin theta)/(1+cot^(2)theta)`
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बायाँ पक्ष `=3sin theta-sin3theta=3sin theta-(3sin theta-4sin^(3)theta)`
`=3sin theta-3sin theta+4sin^(3)theta=4sin^(3)theta=4theta sin^(2)theta`
`=4sin theta.(1)/("cosec"^(4)theta)=(4sin theta)/(1+cot^(2)theta)=` दायाँ पक्ष
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