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Grade: 11 
        
Prove That:
sinA-sin3A+sin5A-sin7A
-------------------------------------   =cot2A
cosA-cos3A-cos5A+cos7A
3 years ago

Answers : (1)

Vikas TU
11138 Points 
							
Apply sinc – sind formulaes in numerator and cosc – cosd in denmoinator with first (2-2)pair
and U would sort out in the finally to cot2a.
3 years ago
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