निम्नलिखित सर्वसमिकाएँ सिद्ध कीजिए जहाँ ...

निम्नलिखित सर्वसमिकाएँ सिद्ध कीजिए जहाँ ये कोण, जिनके लिए व्यंजक परिभाषित है, न्यूनकोण है :
`(sintheta-2sin^(3)theta)/(2cos^(3)theta-costheta)=tantheta`

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