Question

If sin(theta)=-4/5 and (theta) is not in the first quadrant, find cos(theta).
(Also say Chapter name) {answer fast and take all points}

Answer 1

Step-by-step explanation:

sin (thet)=-4/5 since

sin (theta)=perpendicular/hypotenous=p/h

and cos (theta)=base/hypotenous =b/h

Now p^2+b^2=h^2

so we can find b by putting the values of p and h

b^2=5^2-(-4)^2 =9

hence b=3

so cos theta=3/5

And this is from trigonometry