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

The value of cos(40)cos(50)-sin(40)sin(50) is 0

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cos(40)cos(50)-sin(40)sin(50)

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

0

Solution steps

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

\frac{5}{sin ( 2 5 ^{\circ} )}

cos (- i)

cos (0) - cos (π)

arccos (0.02)

arccos (0.07)

What is the value of cos(40)cos(50)-sin(40)sin(50) ?
The value of cos(40)cos(50)-sin(40)sin(50) is 0