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.

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Arun · Answer

I have only written Cos²x = 1 - sin²x And Cos²x -1 = - sin²x Hope it helps Sorry for some lines in whih I forgot to add square sign

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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.htm
i didnt get the 4^th line , could you please epxlain it to me? thank you.

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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.

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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.