1.

Prove that:( 1 + tan 25 ) ( 1 + tan 20 ) = 2.​

Answer»

(1+20)(1+25)= 1 + 20 + 25 + 2025= 1 + 45 * (1 - 2025) + 2025= 1 + 1(1 - 2025) + 2025= 2.



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