Find sin(x/2), cos(x/2), and tan(x/2) from the given information. cos(x) = -4/5, 180° < x < 270° sin(x/2) = cos(x/2) = tan(x/2) =
Added by John M.
Step 1
Since cos x = -4/5 and we know that x is in the third quadrant (180° < x < 270°), we can use the Pythagorean identity to find sin x: sin^2 x + cos^2 x = 1 sin^2 x + (-4/5)^2 = 1 sin^2 x = 9/25 sin x = -3/5 Show more…
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