Find the exact value of cos(120deg + 45deg)?

would you break up the 120 twenty into 60deg and 60deg and then compare them on the chart to pi/3 + pi/3 and then add root 2/2?
in Algebra 1 Answers by Level 1 User (280 points)

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1 Answer

i figured it out. I need the formula: cosu cosv - sinu sinv

that gives me (-1/)2(root2/2) - (root3/2)(root2/2)

which gives me (-root2 - root6)/4
by Level 1 User (280 points)

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