Respuesta :

PSN03

Yo sup??

In 4th quadrant the cosx will be positive.

since sinx=-2/3

we can draw a triangle with height 2 unit and hypotenuse 3 units.

On applying Pythagoras theorem we get the base to be of 5^(1/2)

therefore

cosx=5^(1/2)/3

Hope this helps

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