Cot x- cot(3x)is equal to• 2sinxsin3x• 2cosxcos3x• 2cosxcosec3x• 2sinxcosecx
Avinay Prasad , 6 Years ago
Grade 11
Trigonometry> Cot x- cot(3x)is equal to• 2sinxsin3x• 2c...
1 Answers
Arun
Last Activity: 6 Years ago
Dear Avinay
Cot x - cot 3x = cos x / sinx - cos 3x / sin3x
= cos x sin 3x - cos 3x sin x /(sinx sin 3x)
= Sin2x / sinx sin3x
= 2 sin x. cos x/ sin x sin3x
= 2 cos x . cosec 3x
Hence 3rd option is correct.
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