Solve 12*2^-1+sqrt{9}-2cos60^circ

$$12 \times 2 ^ { - 1 } + \sqrt { 9 } - 2 \cos 60 ^ { \circ }$$

Evaluate

$$8$$

Solution Steps

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

$$12\times \frac{1}{2}+\sqrt{9}-2\cos(60)$$

Multiply 12 and \frac{1}{2} to get 6.

$$6+\sqrt{9}-2\cos(60)$$

Calculate the square root of 9 and get 3.

$$6+3-2\cos(60)$$

Add 6 and 3 to get 9.

$$9-2\cos(60)$$

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

$$9-2\times \frac{1}{2}$$

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

$$9-1$$

Subtract 1 from 9 to get 8.

$$8$$