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The value of cos 22.5 is.........???????? Plxxx answer fast


one year ago

## Answers : (2)

Arun
24738 Points
							 Dear Student,$1+cos 45^{\circ}= 2 cos^222.5^{\circ}$    using 1 + cos 2A = 2 $cos^2A$so    $cos^222.5^{\circ}= (\sqrt{2}+ 1)/2\sqrt{2}$so   $cos22.5^{\circ}= \sqrt{(\sqrt{2}+ 1)/2\sqrt{2}}$       Hope it helpsIn case of any difficulty, please feel free to ask gain. RegardsArun (askIITians forum expert)

one year ago
sushmitha raj
42 Points
							cosA=2cos2A/2-1hereA=45cos45=2cos222.5-1cos22.5=(21/2+1/81/2)½hope it helpsregards all the best for your IIT exam

11 months ago
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### Course Features

• 31 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions