Q.

sec2x(secx+tanx)5dx=14(secx+tanx)4A+13(secx+tanx)2+C then A=

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answer is 0.5.

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Detailed Solution

sec2x(secx+tanx)5dx

Put secx+tanx=t

secx[tanx+secx]dx=dtsecxdx=dttsecx+tanx=tsecxtanx=1t

Add 2secx=t+1t

secx=12t+1t12t+1tt5×dtt=121t5+1t7dt=1214t416t6+c=14(secx+tanx)412+13(secx+tanx)2+cA=1/2

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∫sec2⁡x(sec⁡x+tan⁡x)5dx=−14(sec⁡x+tan⁡x)4A+13(sec⁡x+tan⁡x)2+C then A=