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Elden [556K]
2 years ago
8

Can someone please help me

Mathematics
1 answer:
irga5000 [103]2 years ago
7 0

Answer:

see explanation

Step-by-step explanation:

\frac{3\pi }{4} is an angle in the second quadrant where sin > 0 and cos < 0

cos(\frac{3\pi }{4} )

= cos (π - \frac{3\pi }{4} )

= - cos (\frac{\pi }{4} )

= - \frac{\sqrt{2} }{2}

and similarly

sin (\frac{3\pi }{4} )

= sin (\frac{\pi }{4} )

= \frac{\sqrt{2} }{2}

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