grade 12 · PRE-004

Use a trigonometric identity

Use sine squared plus cosine squared equals one and select the sign from the quadrant.

Learn togetherFresh problem · seed 870856433

If \(\sin\theta=-4/5\) and \(\theta\) is in quadrant III, what is \(\cos\theta\)?

Let's work it out together.

Work through one checkpoint at a time. Your answer area opens after the reasoning.

\(\frac{-3}{5}\)\(\frac{3}{5}\)\(\frac{-4}{5}\)\(\frac{5}{3}\)