Question

tan 28degree ×tan 23 degree ×tan 42 degree × tan 67 degree = 1

Answer 1

please check question .

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Answer 2

Hi dear !!!

here is your answer :-

tan28° × tan23° × tan42° tan67° = 1

Cot (90-42 ) tan42 × cot ( 90 -67 ) × tan67 =1


formula { tan∅ × cot ∅ = 1}

cot42 × tan42 × tan 67× cot 67

1× 1 = 1


hence


LHS = RHS

proved


hope it help you dear !!!


thanks !!