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Find the exact value of the expression: tan[tan^-1(-1)+sin^-1(-4/5)]….help please!

READ ALSO :   A stag-hunt game has characteristic function v(S) = α|S|, S ⊂ N, v(N) = 1, where 1 n >α> 0. (a) Find the normalized stag hunt characteristic function. (b) Find C(0) using the normalization