1.

Find the value of cos (570°)​

Answer»

ong>ANSWER:

=>COS(570°)

=>cos(360°+210°) [ it again REPEAT the angle 210°]

so, cos(210°)

=> cos(180°+30°) [ it is in 3rd QUADRANT and cosθ

NEGATIVE in 3rd quadrant]

so, -cos(30°)

=> -√3/2 (answer)



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