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Popular >

2cos(-120)

Solution

2 cos (- 12 0^{\circ})

Solution

- 1

Solution steps

2 cos (- 12 0^{\circ})

Rewrite using trig identities:

cos (- 12 0^{\circ}) = - \frac{1}{2}

= 2 (- \frac{1}{2})

Simplify

2 (- \frac{1}{2}) : - 1

= - 1

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sin((3pi)/4)cos(pi/(12))+cos((3pi)/4)sin(pi/(12))

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Frequently Asked Questions (FAQ)

What is the value of 2cos(-120) ?
The value of 2cos(-120) is -1