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18-12-2020
Mathematics

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Given: SIn(A)= 4/5 ,pi/2 < A< pi and sin(B)= -2square5/5, pi < B < 3pi/2

What is the value of cos(A-B)

A. -2square5/25
B. -square5/5
C. 2square5/5
D. 11square5/25

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lin17cielo lin17cielo

18-12-2020

I think is The letter A

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