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Find the value of sin^(-1) (sin 5) + cos...

Find the value of `sin^(-1) (sin 5) + cos^(-1) (cos 10) + tan^(-1) {tan(-6)} + cot^(-1) {cot(-10)}`

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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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