Question

cosA=√(1+cosA)² find the value of cos30degree
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Answer 1

Step-by-step explanation:

Hey there!

Given formula: cosA=√1+cos 2A/2

Also, cos 60= 1/2

Required to find: cos 30

Now,

Let A=30,2A=60°

cosA=√1+cos 2A/2

cos 30=√(1+1/2)/2

cos 30=√(3/2)/2

cos 30=√(3/4)=√3/2

Therefore, cos 30=√3/2.

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