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```
if tan^2a=2tab^2b +1 then cos2a +sin^2b is equal to?

```
8 months ago

```							tan^2 A = 1 + 2tan^2 B => sin^2 A / cos^2 A = 1 + 2 sin^2 B / cos^2 B => sin^2 A / cos^2 A = (cos^2 B + 2sin^2 B) / cos^2 B => sin^2 A cos^2 B = cos^2 A (cos^2 B + 2 sin^2 B) => sin^2 A (1 - sin^2 B) = (1 - sin^2 A) (1 - sin^2 B + 2 sin^2 B) => sin^2 A - sin^2 A sin^2 B = (1 - sin^2 A) (1 + sin^2 B) => sin^2 A - sin^2 A sin^2 B = 1 - sin^2 A + sin^2 B - sin^2 A sin^2 B => 2 sin^2 A = 1 + sin^2 B  2 - 2 sin^2 A = 2 -(1 + sin^2 B)2 cos^2 A = cos^2 B
```
8 months ago Saurabh Koranglekar
10341 Points
```							Dear studentPlease find the link belowhttps://www.askiitians.com/forums/Trigonometry/if-tan-2a-1-2tan-2b-then-prove-that-cos-2-b-2-c_194497.htmRegards
```
8 months ago
```							Dear student https://www.askiitians.com/forums/Trigonometry/if-tan-2a-1-2tan-2b-then-prove-that-cos-2-b-2-c_194497.htmGood Luck
```
8 months ago
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