Question

a)
Sec 13/5 x is in 4th quadrant find cot x and
sin x​

Answer 1

in 4 Q sin = -ve , cos = -ve

HOPE THIS HELPS....

Answer 2

Answer:

Step-by-step explanation:cos a+2 cos((a+2pi/3+a-2pi/3)/2 (cosa+2pi/3-a+2pi/3)/2

cos a +2cos 2a/2 cos 4pi/2*3

cos a + 2cosa cos60degree

cos a +2cos a*-1/2

cosa-cosa

0

hence proved