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64. The value of (tan 5° tan 10° tan 15°...tan 85°) is |
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Answer» Tan 5° tan 10° tan 15° ................. tan 75° tan 80° tan 85°______________________________________________________ = tan 5° tan 10° tan 15°.................tan(90-15)° tan(90-10)° tan(90-5)° = tan 5° tan 10° tan 15° ................cot 15° cot 10° cot 5° As tanΘ × cotΘ = 1 Then, = 1_______________ |
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