Find the following trigonometric values. Express your answers exactly. COS cos (7pie/4)= sin (7pie/4)=

Question

Find the following trigonometric values.
Express your answers exactly.
COS
cos (7pie/4)=
sin (7pie/4)=

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Nevaeh 2 weeks 2021-10-01T07:33:15+00:00 1 Answer 0

Answers ( )

    0
    2021-10-01T07:34:52+00:00

    Answer:

    \frac{1}{\sqrt{2} } and – \frac{1}{\sqrt{2} }

    Step-by-step explanation:

    Note that \frac{7\pi }{4} is in the fourth quadrant where

    cos > 0 and sin < 0

    cos(\frac{7\pi }{4} ) = cos (2π – \frac{7\pi }{4} ) = cos(\frac{\pi }{4} ) = \frac{1}{\sqrt{2} }

    ———————————————————-

    sin (\frac{7\pi }{4} ) = – sin(\frac{\pi }{4} ) = – \frac{1}{\sqrt{2} }

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45:7+7-4:2-5:5*4+35:2 =? ( )