1.

The value of cos 180° is

Answer»

\implies

  • WITHIN the unit circle, cosine provides the x coordinate of a point on the surface of the circle. Sine provides the y coordinate of a point on the surface of the circle.

At , 180, the point on the unit circle surface is (−1,0)

. So this MEANS:

x=COS(180°)=−1

y=sin(180°)=0

To find the EXACT value of

cos(180°)−sin(180°)−1−0

0= −1


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