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How to solve : Cos48 . Cos 42 + Cos 48 . Cos 42 = 2

Posted by Pranavsinh Rajput 7 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Vaibhav Jain 7 years, 9 months ago

Noo sorry it's wrong ??

0Thank You

Vaibhav Jain 7 years, 9 months ago

It's too easy just convert cos 42 into sec 48° anwe know that sec theta × cos theta =1 than add 1+1 =2

0Thank You

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CBSE > Class 10 > Mathematics