Respuesta :

Answer:

cos110°

Step-by-step explanation:

using the identity

cos(a + b) = cosacosb - sinasinb

then

cos50°cos60° - sin50°cos60°

= cos(50 + 60)°

= cos110°

silennia

Hi :)

Like i just mentioned we can solve using trig identity

[tex]\tt{cos(a)+cos(b)-sin(a)sin(b)=cos(a+b)}[/tex]

Now we can substitute numbers into the formula

[tex]\tt{cos50cos60-sin50sin60}[/tex]

Add [tex]\tt{50}[/tex], and [tex]\tt{60}[/tex]

[tex]\tt{cos(110)}[/tex]

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