Question #7f4f7

1 Answer
Dec 10, 2017

#cos(x) - (1/sinx) = sin(2x) - 2#

Explanation:

Use the identity:
#sin(2theta) = 2sin(theta)cos(theta)#

#cos(x) - (1/sinx) = sin(x)cos(x) - sin(x)/sin(x)#

#sin(x)cos(x) - 1 = 2sin(x)cos(x) - 2#

#2sin(x)cos(x) - 2 = sin(2x) - 2#