Question

find the value of cos 570 degree is​

Answer 1

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$cos \: {570}^{ \circ}$

$= cos \: \: (6 \times {90}^{ \circ} + {30}^{ \circ})$

$= - cos \: {30}^{ \circ}$

$= - \frac{ \sqrt{3} }{2}$

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Answer 2

Step-by-step explanation:

Cos570 = (90 x 6 + 30)

90's is even so trignometry is not change

And it is lies in third quadrant so sign is change...

Cos 570 = - cos 30

= - root 3 /2