What is the value of cos(70)cos(20)-sin(70)sin(20) ?

The value of cos(70)cos(20)-sin(70)sin(20) is 0

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

cos(70)cos(20)-sin(70)sin(20)

cos (7 0^{\circ}) cos (2 0^{\circ}) - sin (7 0^{\circ}) sin (2 0^{\circ})

0

Solution steps

cos (7 0^{\circ}) cos (2 0^{\circ}) - sin (7 0^{\circ}) sin (2 0^{\circ})

Rewrite using trig identities:

cos (9 0^{\circ})

= cos (9 0^{\circ})

Use the following trivial identity:

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

= 0

arctan (\frac{8}{3})

cos (4 3^{\circ})

arccos (cos (\frac{2 π}{3}))

tan (arccos (\frac{4}{5}))

cos (1 + i)

What is the value of cos(70)cos(20)-sin(70)sin(20) ?
The value of cos(70)cos(20)-sin(70)sin(20) is 0