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sumit53333:
Please explain the second line
Sure...
sin 85 is cos ( 90 -5) = cos 5
So sin ^2 85 is cos^2 5
wait.. I will post a more explaned solution
How did sin^2 45 came in the middle of the second line
Imagine this as a sequence of 5, 10, 15, ......., 85
Middle term will be 45
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