Solve 20cos(47)+8cos(180)+13cos(0)

$$20 \cos ( 47 ) +8 \cos ( 180 ) +13 \cos ( 0 )$$

Evaluate

$$18.63996720124997$$

Solution Steps

Evaluate trigonometric functions in the problem

$$20 \cdot 0.6819983600624985 + 8 \cos(180) + 13 \cos(0)$$

Multiply 20 and 0.6819983600624985 to get 13.63996720124997.

$$13.63996720124997+8\cos(180)+13\cos(0)$$

Get the value of \cos(180) from trigonometric values table.

$$13.63996720124997+8\left(-1\right)+13\cos(0)$$

Multiply 8 and -1 to get -8.

$$13.63996720124997-8+13\cos(0)$$

Subtract 8 from 13.63996720124997 to get 5.63996720124997.

$$5.63996720124997+13\cos(0)$$

Get the value of \cos(0) from trigonometric values table.

$$5.63996720124997+13\times 1$$

Multiply 13 and 1 to get 13.

$$5.63996720124997+13$$

Add 5.63996720124997 and 13 to get 18.63996720124997.

$$18.63996720124997$$