find the value of cot10'cot30'cot80(cbse2015)
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cot 30 cot 10 cot 80 =
cot 30 cot (90-80) cot 80 =
cot 30 tan 80 cot 80 =
cot 30 = √3
because tanx . cot x = 1
cot 30 cot (90-80) cot 80 =
cot 30 tan 80 cot 80 =
cot 30 = √3
because tanx . cot x = 1
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