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Write the principal value of tan^(-1)(1)...

Write the principal value of `tan^(-1)(1)+cos^(-1)(-1/2)`

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`tan^(-1)1+cos^(-1)(-1/2)`
`=tan^(-1)tan(pi/4)+cos^(-1)(-cos frac{pi}{3})`
`tan^(-1)(tanfrac{pi}{4})+cos^(-1)[cos(pi-frac{pi}{3})]`
`=pi/4+(2pi)/3=>frac{11pi}{12}`
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