Use a graphing calculator to make a conjecture as to whether each equation is an identity.
-$\sin 2 x = 2 \sin x$
A) Identity
B) Not an identity

Question

Quizplus · Accepted Answer

An identity means the equation holds true for all values of the variable. Graphing $\sin 2x$ and $2 \sin x$ shows that they do not overlap completely for all values of $x$, indicating that the equation is not an identity. The correct equation for a double angle identity involving sine is $\sin 2x = 2 \sin x \cos x$, not $2 \sin x$.

Use a Graphing Calculator to Make a Conjecture as to Whether