tan 1.tan2.tan3.---------tan89
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tan 89 = cot 1
tan 88 = cot 2
similarly
tan 46 = cot 44
and tan y × cot y = 1 so from tan 1 to tan89 except tan 45 after multiplying ans is 1 and tan 45 =1
So, finally 1 × tan 45 = 1
tan 88 = cot 2
similarly
tan 46 = cot 44
and tan y × cot y = 1 so from tan 1 to tan89 except tan 45 after multiplying ans is 1 and tan 45 =1
So, finally 1 × tan 45 = 1
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