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Cosec2a+cosec4a=cota-cot4a​

User Joel Mellon
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1 Answer

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Answer: Cosec 2 A + Cot 4 A = Cosec 4 A - Cot 2 A

Explanation:

Taking LHS :

⇒Cosec 2 A + Cot 4 A

⇒Cosec 2 A + ( Cot 2 A )2

⇒Cosec 2 A + ( Cosec 2 A - 1 )2 ( we know : 1 + Cot 2 θ = Cosec 2 θ )

⇒Cosec 2 A + Cosec 4 A + 1 - 2 Cosec 2 A

⇒ Cosec 4 A + 1 - Cosec 2 A

⇒ Cosec 4 A + 1 - ( 1 + Cot 2 A)

⇒ Cosec 4 A + 1 - 1 - Cot 2 A

⇒ Cosec 4 A - Cot 2 A

or cosec2A+cosec4A=cotA-cot4A

User Jpgerek
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