What is the value of cos(80)cos(10)-sin(80)sin(10) ?

The value of cos(80)cos(10)-sin(80)sin(10) is 0

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cos(80)cos(10)-sin(80)sin(10)

cos (8 0^{\circ}) cos (1 0^{\circ}) - sin (8 0^{\circ}) sin (1 0^{\circ})

0

Solution steps

cos (8 0^{\circ}) cos (1 0^{\circ}) - sin (8 0^{\circ}) sin (1 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

cot (5 4^{\circ})

arccot (- 8)

sin^{3} (\frac{3 π}{2})

cos (28. 5^{\circ})

2 cos^{2} (3 5^{\circ}) - 1

What is the value of cos(80)cos(10)-sin(80)sin(10) ?
The value of cos(80)cos(10)-sin(80)sin(10) is 0