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If sin ^-1(sin 4)^-1+cos ^-1(cos 8)+tan...

If `sin ^-1(sin 4)^-1+cos ^-1(cos 8)+tan ^-1(tan 6)+cot ^-1 .(cot 10)=a div b pi`, then `(a+b)` equals where `a` and `b` are co-prime then find the value of `(a^3+b^3)`.

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