7. The value of tan 15º tan 20'tan 70°tan 75° is
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Step-by-step explanation:
tan15°tan20°tan70°tan75°
= tan(90°-75°)tan(90°-70°)tan70°tan75°
= cot75°cot70°tan70°tan75°
= 1
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Answered by
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Hey!!!!!!Hope it helps
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