2012 · Q56
The expression sin^2 x + cos^2 x - 1 = 0 is satisfied by how many values of x?
Elementary MathematicsTrigonometry
- AOnly one value of x
- BTwo values of x
- CInfinite values of x
- DNo value of x
Explanation
sin^2 x + cos^2 x = 1 is an identity, so the equation holds for every x.