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22 of trigonometry in exercise 3.2

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22 of trigonometry in exercise 3.2

Posted by Parvej Alam 6 years, 2 months ago

CBSE > Class 11 > Mathematics

1 answers

Rajay Raj 6 years, 2 months ago

Cot (3x)=cot (2x+x) =>cot3x =(cot 2x cotx -1)÷(cot2x+cotx) [by cot(x+y)formula] =>cot3x (cot2x+cotx)=cotx cot2x -1 =>cot3x cot2x + cot3x cotx =cotx cot2x -1 =>cotx cot2x - cot3x cot2x - cot3x cotx =1 =>LHS

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CBSE > Class 11 > Mathematics