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tia_tia [17]
3 years ago
14

Find the exact values ofcos (3pi/4radians) and sin (3pi/4 Radians)

Mathematics
1 answer:
allsm [11]3 years ago
7 0
\cos\dfrac{3\pi}{4}=\cos\left(\pi-\dfrac{\pi}{4}\right)=-\cos\dfrac{\pi}{4}=-\dfrac{\sqrt2}{2}

\sin\dfrac{3\pi}{4}=\sin\left(\pi-\dfrac{\pi}{4}\right)=\sin\dfrac{\pi}{4}=\dfrac{\sqrt2}{3}

Look at the picture.

\dfrac{\pi}{2} \ \textless \  \dfrac{3\pi}{4} \ \textless \  \pi\\\\therefoere\\\\\cos\dfrac{3\pi}{4} \ \textless \  0\ and\ \sin\dfrac{3\pi}{4} \ \textgreater \  0

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