Lutasin ang 2cos^222.5^circ-1

$$2 \cos ^ { 2 } 22.5 ^ { \circ } - 1$$

I-evaluate

$$0.70710678118654731697812577919378$$

Mga Hakbang ng Solution

Evaluate trigonometric functions in the problem

$$2 \cdot 0.9238795325112867 ^ {2} - 1$$

Kalkulahin ang 0.9238795325112867 sa power ng 2 at kunin ang 0.85355339059327365848906288959689.

$$2\times 0.85355339059327365848906288959689-1$$

I-multiply ang 2 at 0.85355339059327365848906288959689 para makuha ang 1.70710678118654731697812577919378.

$$1.70710678118654731697812577919378-1$$

I-subtract ang 1 mula sa 1.70710678118654731697812577919378 para makuha ang 0.70710678118654731697812577919378.

$$0.70710678118654731697812577919378$$