[IIT 1983] Find the value of tan [ arccos(4/5) + arctan(2/3) ].
The value of (tan 1^∘tan 2^∘tan 3^∘…tan 89^∘) is (A) 0 (B) 1 (C) 2 (D) 1/2
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The value of `cot(cosec^(-1)(5)/(3)+tan^(-1)""(2)/(3))` is