© examsiri.com
Question : 72 of 160
Marks:
+1,
-0
Solution:
‌‌ Let ‌I=∫(‌+‌| sin‌3x+cos3x |
| sin‌2xcos2x |
)‌dx‌‌ again let ‌I1=∫‌‌dx‌‌ And ‌I2=∫‌| sin‌3x+cos3x |
| sin‌2xcos2x |
‌dx‌∴I1=∫x−2‌dx=‌+c1=−‌+c1‌‌ And ‌I2=∫(‌+‌)‌dx‌=∫(tan‌x‌ ‌s‌e‌c‌x+cot‌x‌cosec‌x)‌dx‌=∫tan‌x‌ ‌s‌e‌c‌x‌dx+∫cot‌x‌cosec‌x‌dx‌= secx+(−cosec‌x)+c2‌∴I=I1+I2=−‌+ secx−cosec‌x+C‌⇒I=−‌+‌−‌+C‌=‌| −(cos‌x‌s‌i‌n‌x)+xsin‌x−x‌cos‌x |
| x‌cos‌x‌s‌i‌n‌x |
+C‌=‌| x(sin‌x−cos‌x)−cos‌x‌s‌i‌n‌x |
| x‌cos‌x‌s‌i‌n‌x |
+C
© examsiri.com
Go to Question: