1.

`int(sec xdx)/(sqrt(sin(2x+A)+sinA)) " is equal to "`A. `(secA)/(sqrt(2))sqrt(tanx cosA-sinA)+c`B. `sqrt(2)secAsqrt(tanx cosA-sinA)+c`C. `sqrt(2)secAsqrt(tanx cosA+sinA)+c`D. non of these

Answer» Correct Answer - C
`I=int(sec x dx)/(sqrt(2sin(x+A)cosx))`
`=int(sec^(2)x dx)/(sqrt((2sin(x+A))/(cosx)))`
`=(1)/(sqrt(2))int(sec^(2)x dx)/(sqrt(tanx cosA+sinA))`
`=(secA)/(sqrt(2))int(2pdp)/(p) " " (tanx cosA+sinA=p^(2), " then " cosA sec^(2)x dx=2pdp)`
`=sqrt(2)secA int dp `
` =sqrt(2)secA sqrt(tanx cosA+sinA)+C`


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