© examsiri.com
Question : 74 of 160
Marks:
+1,
-0
Solution:
I=∫x2‌‌dxPut
x=tan‌θ⇒dx= sec2θdθI‌=∫tan2θ⋅‌‌=∫θ⋅‌dθ=∫θ(sin‌2θ)dθ‌=∫θ(‌)dθ‌=‌‌∫θ(1−cos‌2‌θ)dθ‌=‌‌∫θdθ−∫θ‌cos‌2‌θ‌d‌θ‌=‌(‌−‌−‌)+C‌=‌−‌sin‌2θ−‌‌cos‌2‌θ+C‌=‌−‌⋅(‌)−‌‌+C‌=‌−‌+C
© examsiri.com
Go to Question: