Question

A trigonometric equation holds true for value(s) of the argument

• A. all
• B. some
• C. exactly one

Answer 1

The correct option is B some

A trigonometric identity hold good for all real values. On the other hand, trigonometric equations hold good for some values of the argument.
For example -
${\sin }^{2}x+{\cos }^{2}x=1$
is an identity because it holds good for all real values of x.
where as $\sin x=\frac{1}{2}$
is an equation as it is valid for only some values of x.