cot 1 cot 2....................cot 88 cot89 = ?
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Answered by
88
cot1.cot2.cot3 ……………..cot87.cot88.cot89
we know,
cot1 =cot(90-89) = tan89
cot1.cot89 =1
in the same way ,
cot2.cot88 =1
core.cot87 =1
..…………
{cot1.cot89}{cot2.cot88}{cot3.cot87}.……
=1 × 1 × 1 × 1 …………
=1
we know,
cot1 =cot(90-89) = tan89
cot1.cot89 =1
in the same way ,
cot2.cot88 =1
core.cot87 =1
..…………
{cot1.cot89}{cot2.cot88}{cot3.cot87}.……
=1 × 1 × 1 × 1 …………
=1
Answered by
9
Answer:
cot 1 cot 2 ............ cot (90-2) cot (90-1)
cot1 cot 2............tan2 tan 1
1.1.....1 1
1
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