Solve 4-2cos(60)--2^-1

$$4-2 \cos ( 60 ) - { -2 }^{ -1 }$$

Evaluate

$$\frac{7}{2}=3.5$$

Solution Steps

Get the value of \cos(60) from trigonometric values table.

$$4-2\times \frac{1}{2}-\left(-2\right)^{-1}$$

Multiply 2 and \frac{1}{2} to get 1.

$$4-1-\left(-2\right)^{-1}$$

Subtract 1 from 4 to get 3.

$$3-\left(-2\right)^{-1}$$

Calculate -2 to the power of -1 and get -\frac{1}{2}.

$$3-\left(-\frac{1}{2}\right)$$

The opposite of -\frac{1}{2} is \frac{1}{2}.

$$3+\frac{1}{2}$$

Add 3 and \frac{1}{2} to get \frac{7}{2}.

$$\frac{7}{2}$$