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Prove that :Sin theta -2sin ^3 …

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Prove that :Sin theta -2sin ^3 theta /2 cos^3 theta-cos theta=tan theta

Posted by Aryan Dewangan 3 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Lavanya Kalai 3 years, 2 months ago

Sin○-2sin^3○/2cos^3○-cos○ =sin○(1-2sin^2○)/cos○(2cos^2○-1) =sin○(2cos○)/cos (2cos○) Because 2cos^2○-1 and 1-2sin^2○=cos2○ Cut cos2○ and cos2○ Hence sin/cos=tan is proved

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Jasmeen Kaur 3 years, 2 months ago

Sin○-2sin^3○/2cos^3○-cos○ =sin○(1-2sin^2○)/cos○(2cos^2○-1) =sin○(2cos○)/cos (2cos○) Because 2cos^2○-1 and 1-2sin^2○=cos2○ Cut cos2○ and cos2○ NOW,sin/cos=tan○

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CBSE > Class 10 > Mathematics