SOLUTION: 7 cos sigma +8 sqroot 2=5 cos sigma+7sqroot 2

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Question 889517: 7 cos sigma +8 sqroot 2=5 cos sigma+7sqroot 2
Answer by lwsshak3(11628) About Me  (Show Source):
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7 cos sigma +8 sqroot 2=5 cos sigma+7sqroot 2
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use x for sigma
for interval [0,2π)
solve for x
7cosx+8√2=5cosx+7√2
2cosx=-√2
cosx=-√2/2
x=5π/4, 7π/4