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

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

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

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

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

0

Solution steps

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

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

cos (arccos (\frac{2}{2}))

arctan (\frac{1}{2 2})

arccsc (- \frac{5}{2})

cos^{2} (- \frac{π}{4})

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