Q.
If the integral ∫5tanxtanx-2 dx=x+alog|sinx-2cosx|+K, then a is equal to
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a
-1
b
-2
c
1
d
2
answer is D.
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Detailed Solution
∫5tanxtanx-2dx=∫5sinxsinx-2cosxdxPut 5sinx=Addx(sinx-2cosx)+B(sinx-2cosx) =A(cosx+2sinx)+b(sinx-2cosx) =A(cosx+2sinx)+b(sinx-2cosx) Comparing like coefficients on both sides 5=2A+B and 0=A-2B ∴A=2,B=1 Now,∫5sinxsinx-2cosx dx=2∫cosx+2sinx(sinx-2cosx)dx+∫sinx-2cosxsinx-2cosx dx =2log(sinx-2cosx)+x+K =x+alog(sinx-2cosx)+K (given) ⇒a=2
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