bearing in mind that, on the III Quadrant, sine as well as cosine are both negative, and that hypotenuse is never negative, so, if the sine is -4/5, the negative number must be the numerator, so sin(x) = (-4)/5.
Answer:
Explanation:
Look at the pictures.
We have
Calculate the value of x:
In Quadrat III, cosine is negative. Therefore x = -3.
Calculate the cosine:
Substitute to the formula of the tan x/2:
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