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Question
Evaluate:
`tan{cos^-1(-7/25)}`
Solution
`tan{cos^-1(-7/25)}=tan{cos^-1(pi-7/25)}`
`=-tan{cos^-1(7/25)}`
`=-tan{tan^-1[sqrt(1-(7/25)^2)/(7/25)]}`
`=-tan{tan 24/7}`
`=-24/7`
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