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Q)

tan^-1 + cos^-1(-1/2) + sin^-1(-1/2)

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tan^-1(1)+cos^-1(-1/2)+sin^-1(-1/2) =tan^-1(tanπ/4) + π-cos^-1(cosπ/4)-sin^-1(sin1/2) =π/4+π-π/3-π/6 =3π/4
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