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a
12lnsinx−cosx+x2+c
b
12lnsinx+cosx+c
c
12lnsinx+2cosx+c
d
None of these
answer is A.
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Detailed Solution
Let Nr=Addx(Dr)+B(Dr)sinx=Addx(sinx−cosx)+B(sinx−cosx)sinx=A(cosx+sinx)+B(sinx−cosx)0.cosx+1⋅sinx=(A−B)cosx+(A+B)sinx On comparing both sides A−B=0 and A+B=1 Solving we get A=12 B=12∫sinxsinx−cosxdx=∫12(cosx+sinx)+12(sinx−cosx)sinx−cosxdx=12∫cosx+sinxsinx−cosxdx+12∫sinx−cosxsinx−cosxdx=12loge|sinx−cosx|+12∫1dx=12lnsinx−cosx+12x+c