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Grade: 12 

                        
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.
3 years ago

Answers : (1)

Arun
24742 Points 
							
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
3 years ago
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