Question

Tan 48 degree tan 16 degree tan 42 degree tan 74 degree =1

Answer 1

Answer:

I can prove it

Step-by-step explanation:

Tan48°= -cot42°

tan74° = -cot16°

substitute the above values in the given equation

-cot42°× tan16° × tan42° × -cot16° = 1

1=1 { ∵ -(-)=+ , cotA × tanA = 1 }

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