SinA =0.5
cosA=?
if SinA=1/2, then A must be 30 deg. So what is the cos30? Denke.
To find the value of cos(A) given that sin(A) = 0.5, we can use the Pythagorean identity for trigonometric functions.
The Pythagorean identity states that sin^2(A) + cos^2(A) = 1.
Since we know that sin(A) = 0.5, we can substitute this value into the equation and solve for cos(A).
(0.5)^2 + cos^2(A) = 1
0.25 + cos^2(A) = 1
cos^2(A) = 1 - 0.25
cos^2(A) = 0.75
Taking the square root of both sides,
cos(A) = ±√0.75
Simplifying the square root,
cos(A) = ±√(3/4)
cos(A) = ±√3/√4
cos(A) = ±√3/2
Therefore, cos(A) can be either √3/2 or -√3/2, depending on the quadrant in which angle A lies.