Question

solution.............

Answer 1

Hey !!!!

So simple one !!☺

tan50° = tan ( 40° + 10°)

tan ( A+ B ) = tanA+tanB /1-tanA×tanB by using this formula

tan50° = tan40° + tan10°/1-tan40°×tan10°

tan50° (1 - tan40°×tan10° ) = tan40° + tan10°

tan50° -tan50° ×tan40°×tan10° = tan40° +tan10°

tan50° = tan40° + tan10° + tan50° ×tan40° ×tan10° ..

tan50° = tan40° + tan10° + tan(90° -40°) ×tan40° ×tan10 °

tan50° = tan40° + tan10° + cot40° ×tan40° ×tan10° .

tan50° = tan40° + tan10° + tan10°

tan50° = tan40° + 2tan10° prooved here



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Hope it helps you !!!

@Rajukumar111