Home › TS EAPCET (Engineering) › Mathematics › Trigonometric Functions › A point has sine 3/5 and sits in the second quad…
A point has sine 3/5 and sits in the second quadrant; its cosine is
A4/5
B3/4
C-3/5
D-4/5
Answer & Solution
Correct answer: D. -4/5
cos²x = 1 - 9/25 = 16/25, and cosine is negative in the second quadrant, so cos x = -4/5.
Related questions
Inside (0, π/2), the angle where tan x equals its own reciprocal isThe least positive root of the equation sin 2x = sin x isAdding every root of 2 sin x cos x = sin x on [0, π] givesBetween 0 and 2π inclusive, how many angles satisfy sin 2x = 1?Solving sin x = sin α completely, with n an integer, givesTangent takes positive values in which pair of quadrants?Halving the angle inside a cosine stretches its repetition length toThe sine wave of 3x repeats after how much increase in x?