find the value of trigonometric ratio of cos 45/2
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Answer:
0.923879532
Step-by-step explanation:
cos 45 = cos (45/2 + 45/2)
= cos^2(45/2) - sin^2 45/2
= cos^2(45/2) - [1 - cos^2(45/2)]
= 2cos^2(45/2) - 1
Now
cos(45)+1 = 2cos^2(22.5)
we know that cos45 =1/√2
√(1/√2 + 1)/2= cos(22.5)
=0.923879532
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