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QUESTION :- ⤵️
Evaluate without using trignometrical tables :- tan 20° . tan 40° tan 50° tan 70°
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tan20°tan40°tan50°tan70°
cot(90-20)°cot(90-50)°tan50°tan70°
cot20°tan20°cot50°tan50° = 1
The answer is 1.
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