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Question : 77 of 160
Marks:
+1,
-0
Solution:
Let
I=‌‌dx‌‌‌⋅⋅⋅⋅⋅⋅⋅(i)‌I=‌| (cos(−x))3 |
| (cos(‌−x))3+(sin‌(‌−x))3 |
‌dx=‌‌| −sin‌3x |
| −sin‌3x−cos3x |
‌dx=‌‌‌dx‌‌‌⋅⋅⋅⋅⋅⋅⋅(ii)On adding in Eqs. (i) and (ii), we get
⇒2I=dx=‌∴‌I=‌
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