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http://www.askiitians.com/forums/Integral-Calculus/1-cos3x-cosx-dx-please-say-how-to-simply_188653.htm i didnt get the 4 th line , could you please epxlain it to me? thank you. http://www.askiitians.com/forums/Integral-Calculus/1-cos3x-cosx-dx-please-say-how-to-simply_188653.htmi didnt get the 4th line , could you please epxlain it to me? thank you.
I have only writtenCos²x = 1 - sin²xAndCos²x -1 = - sin²xHope it helpsSorry for some lines in whih I forgot to add square sign
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