निम्नलिखित के मान ज्ञात कीजिए :
`tan^(-1)(1)+cos^(-1)(-(1)/(2))+sin^(-1)(-(1)/(2))`

Explanation

`tan^(-1)(1)+cos^(-1)(-(1)/(2))+sin^(-1)(-(1)/(2))`
`(":.sin^(-1)x+cos^(_1)x=(pi)/(2))`
`=tan^(-1)(tan""(pi)/(4))+(pi)/(2)=(pi)/(4)+(pi)/(2)=(3pi)/(4)`