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Find the value of sin^(-1)(sin5)+cos^(-1...

Find the value of `sin^(-1)(sin5)+cos^(-1)(cos10)+tan^(-1){tan(-6)}+cot^(-1){cot(-10)}dot`

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`sin^(-1) (sin 5) + cos^(-1) (cos 10) + tan^(-1) {tan (-6)}`
`= sin^(-1) (sin 5) + cos^(-1) (cos 10) - tan^(-1) {tan (6)}`
`= (5 - 2pi) + (4 pi- 10) - (6 - 2pi) + pi (10 - 3 pi)`
`= 8 pi - 21`
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