[" 140"" शिललाल हायर सेकर्जडी गाणित : क्...

[" 140"" शिललाल हायर सेकर्जडी गाणित : क्रक्षा "XI],[" 7."(cos A+sin A)/(cos A-sin A)-(cos A-sin A)/(cos A+sin A)=2tan2A.],[sin(A+3B)+sin(3A+B)=2cos(A+B)]

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