Selesaikan cos(75^circ)cos(105^circ)+sin(75^circ)sin(105^circ)

$$\cos ( 75 ^ { \circ } ) \cos ( 105 ^ { \circ } ) + \sin ( 75 ^ { \circ } ) \sin ( 105 ^ { \circ } )$$

Evaluasi

$$0,866025403784438655459800018657461$$

Langkah Solusi

Evaluate trigonometric functions in the problem

$$0,25881904510252074 \cdot -0,25881904510252085 + 0,9659258262890683 \cdot 0,9659258262890683$$

Kalikan 0,25881904510252074 dan -0,25881904510252085 untuk mendapatkan -0,066987298107780693519592063407429.

$$-0,066987298107780693519592063407429+0,9659258262890683\times 0,9659258262890683$$

Kalikan 0,9659258262890683 dan 0,9659258262890683 untuk mendapatkan 0,93301270189221934897939208206489.

$$-0,066987298107780693519592063407429+0,93301270189221934897939208206489$$

Tambahkan -0,066987298107780693519592063407429 dan 0,93301270189221934897939208206489 untuk mendapatkan 0,866025403784438655459800018657461.

$$0,866025403784438655459800018657461$$