Question

1-cos2A/1+cos2A का मान​

Answer 1

Use the relation `cos(2A) = 2*cos^2A - 1 = 1 - 2*sin^2A'

`(1 - cos(2A))/(1 + cos(2A))`

=> `(1 - (1 - 2*sin^2A))/(1 + 2*cos^2A - 1)`

=> `(1 - 1 + 2*sin^2A)/(1 + 2*cos^2A - 1)`

=> `(2*sin^2A)/(2*cos^2A)`

=> `(sin^2A)/(cos^2A)`

=> `((sin A)/(cos A))^2`

=> `tan^2A`

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