Find the exact value of cos 180° - sin 180°?

We have to find the value of cos 180º – sin 180º


We know that

Cos 180°= -1

and also

sin 180°=0

So cos 180º – sin 180º

Substituting the values in the above equation we get

cos 180º – sin 180º

= -1 -0



Hence, cos 180º – sin 180º =-1

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