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