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let veca , vecb and vecc be three vector...

let `veca , vecb and vecc` be three vectors having magnitudes 1, 1 and 2, respectively, if `vecaxx(vecaxxvecc)+vecb=vec0, ` then the acute angle between `veca and vecc` is _______

A

`90^@`

B

`60^@`

C

`45^@`

D

`30^@`

Text Solution

Verified by Experts

The correct Answer is:
A, B, D
`inte^(xsec^(2)x-tanx)(xtanx-(sin2x)/2)dx=inte^(xsec^(2)x-tanx)((cos^(2)x)/2(xsec^(2)x-tanx)'+((cos^(2)x)/2))`
`=e^(xsec^(2)x-tanx).(cos^(2)x)/2+c`
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