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5 votes
Cos() =

O A. 2
2
○ B.
Oc.
O D.
12

뭐~

2

Cos() = O A. 2 2 ○ B. Oc. O D. 12 ㅊ 뭐~ 욜 2-example-1
User AMother
by
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1 Answer

4 votes

Answer:

A

Explanation:

cos (90°+α) = sin α

or cos (π/2 + α) = sin α

Now, 3π/4 = π/2 + π/4

cos (3π/4) = cos (π/2 + π/4) = sin (π/4)

sin (π/4) = √2/2

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