Solve (4)2cos^222*5^circ-1

$$( 4 ) 2 \cos ^ { 2 } 22 \cdot 5 ^ { \circ } - 1$$

Evaluate

$$-1.93582222752408767836246641727752$$

Solution Steps

Evaluate trigonometric functions in the problem

$${(4)} \cdot 2 \cdot -0.3420201433256687 ^ {2} - 1$$

Multiply 4 and 2 to get 8.

$$8\left(-0.3420201433256687^{2}\right)-1$$

Calculate 0.3420201433256687 to the power of 2 and get 0.11697777844051095979530830215969.

$$8\left(-0.11697777844051095979530830215969\right)-1$$

Multiply 8 and -0.11697777844051095979530830215969 to get -0.93582222752408767836246641727752.

$$-0.93582222752408767836246641727752-1$$

Subtract 1 from -0.93582222752408767836246641727752 to get -1.93582222752408767836246641727752.

$$-1.93582222752408767836246641727752$$

Factor

$$-1.93582222752408767836246641727752$$