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grade 12 · PRE-004

Use a trigonometric identity

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

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Try with a hintFresh problem · seed 604988358

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

Quadrant IV

Give me one hint

Use \(\sin^2\theta+\cos^2\theta=1\).

Choose an answer\(\frac{3}{5}\)\(\frac{-3}{5}\)\(\frac{-4}{5}\)\(\frac{5}{3}\)

It is always okay to go back to more help.

Math Lab is a working name for Ready Rung's separate math-learning product. Guided success and independent evidence are reported separately.