Question

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

Answer 1

Explanation:

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

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

`\cos(a) + 2( - ( \cos(a) )/(2) + ( √(3) )/(2) \sin(a) )`

`\cos(a) - \cos(a) + √(3) \sin(a)`

`√(3) \sin(a)`

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