What is the value of sin(50)sin(10)-2cos(40)-2cos(20) ?

The value of sin(50)sin(10)-2cos(40)-2cos(20) is -3.27845…

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

sin(50)sin(10)-2cos(40)-2cos(20)

sin (5 0^{\circ}) sin (1 0^{\circ}) - 2 cos (4 0^{\circ}) - 2 cos (2 0^{\circ})

- 3.27845 \dots

Solution steps

sin (5 0^{\circ}) sin (1 0^{\circ}) - 2 cos (4 0^{\circ}) - 2 cos (2 0^{\circ})

Refine to a decimal form

= - 3.27845 \dots

3 sin (\frac{π}{3}) - \frac{1}{2} cos^{2} (\frac{π}{3}) - \frac{7}{8}

cos (\frac{3 π}{4}) + i \cdot sin (\frac{3 π}{4})

cos^{3} (9 0^{\circ})

4 + \frac{3 2}{2} cos (\frac{3 π}{4})

\frac{1}{cos ^{2} ( \frac{π}{3} )}

What is the value of sin(50)sin(10)-2cos(40)-2cos(20) ?
The value of sin(50)sin(10)-2cos(40)-2cos(20) is -3.27845…