If sin x 35 x in quadrant III then sin 2x cos 2x tan 2x
If sin x = -3/5, x in quadrant III, then sin 2x = cos 2x = tan 2x =
Solution
sinx=-3/5
in third quadrant cos xis negative
cos x= adjacent/hypotenuse
here opposite=3 and hypotenuse=5
adjacent=4
cos x= -4/5
sin 2x=2sinx cos x=2(-3/5)(-4/5)= 24/25
cos 2x=2cos2x-1 = 2(-4/5)2-1= 7/25
tan 2x=sin2x/cos 2x= 24/7
