The expression $sin^2$ x + $cos^2$ x-1=0 is satisfied by how many values of x?

[ A ]    Only one value of x
[ B ]    Two values of x
[ C ]    Infinite values of x right
[ D ]    No value of x
Answer : Option C
Explanation :
Given that, $sin^2$ x + $cos^2$ x-1=0
==> $sin^2$ x + $cos^2$x=1
which is an identity of trigonometric ratio and always true for every real value of x. Therefore, the equation has an infinite solution.

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