Inactive Tutor answered • 02/03/20
Tutor
New to Wyzant
Hi Judite,
Use the formula for the cosine of the sum of 2 angles.
cos(x+y) = cos(x)cos(y) - sin(x)sin(y)
Raquel R.
asked • 02/03/20If tanx=−1, and 90°<x<180°, find cos(x+30°).
Help please...................
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