1.

Prove that tan48· tan23· tan42· tan67·=1

Answer» tan48×tan42×tan23×tan67tan48×tan(90-48)×tan(90-67)×tan67tan48×cot48×cot67×tan67=1
Tan.48tan.23.tan42.tan67=1. Tan48.cot.48.tan23.cot.24=1. T


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