Math, asked by das766245, 7 months ago

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

Answers

Answered by KingzSoul
0

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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