Mathematics
Mathematics, 18.08.2019 11:50, ayoismeisalex

Review important identitie
cosx cosy = 1/2 [cos(x+y) + cos(x−y)]

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if sin(x) = 1/3 and sec(y) = 25/24 , where x and y lie between 0 and π/2, evaluate the expression using trigonometric identities. (enter an exact answer.) what i know: cos (y) = 25/24 sin (x + y) = (sinx)(cosy) + (cosx)(siny) sin (x + y) = (1/3)(24/25) + (cosx)(siny) how do you get cosx and siny? .
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Review important identitie
cosx cosy = 1/2 [cos(x+y) + cos(x−y)]...

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