1.

Let f(x)= sin^(2)""x/2+cos^(2)""x/2 and g(x)=sec^(2)x-tan^(2)x. The two functions are equal over the set

Answer»

`phi`
R
`R-{x|x=(2n+1) pi/2, N in Z}`
`R-{0}`

Answer :C


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