Math, asked by ricky5581, 9 months ago

Cot40°.cot130°+cot130°.cot10°+cot10°.cot40° is

Answers

Answered by adulrakha
0

cot130 = cot (90 + 40) = -cot40

therefore cot130 x cot40= -cot²40

cot130 x cot10 = - cot40 x cot10

therefore, answer,

Cot40°.cot130°+cot130°.cot10°+cot10°.cot40°

=Cot²40° - cot40°.cot10° + cot10°.cot40°

=Cot²40°

I hope you have understood fam

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