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den301095 [7]
2 years ago
10

Questione Simplify Cosa + 2Cos(a +240")​

Mathematics
1 answer:
melamori03 [73]2 years ago
7 0

Step-by-step explanation:

\cos(a)  + 2 \cos(a + 240)

\cos(a)  + 2 \cos(a)  \cos(240)  -  \sin(a)  \sin(240)

\cos(a)  + 2( -  \frac{ \cos(a) }{2}  +   \frac{ \sqrt{3} }{2}   \sin(a) )

\cos(a)  -  \cos(a)  +  \sqrt{3}  \sin(a)

\sqrt{3}  \sin(a)

If you graph the new identity, and the og identiy, they will be conciding graphs, so they are the same identity.

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Answer:

D

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The formula we need to solve this is:

d_1+d_2=2a

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<em>Now we can plug into the equation and solve:</em>

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