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If equals to 30 degree verify …

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If equals to 30 degree verify that cos 2A equals to 1 minus 10 squared upon 1 + 10 square A

Posted by Sanskriti Jais 5 years, 11 months ago

CBSE > Class 10 > Mathematics

3 answers

Piyush Kr.?? 5 years, 11 months ago

In the question...

0Thank You

Piyush Kr.?? 5 years, 11 months ago

There should A=30° in place of equals to 30°........its a typing mistake????

1Thank You

Piyush Kr.?? 5 years, 11 months ago

Since A=30°, Cos2A=1-tan^2A/1+tan^2A L.H.S=cos2A=cos2*30°=cos60°=1/2 R.H.S=1-tan^A/1+tan^A={1-(1/√3)^2}/{1+(1/√3)^2}=(1-1/3)/(1+1/3)=(2/3)/(4/3)=1/2 Hence LHS=RHS

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