Question

HELP PLEASE: Verify the Identity cot[x-pi/2] = -tanx

Answer 1

Cot(A-B) = (CotACotB+1)/(CotB-CotA), you will probably need that identity

Answer 2

Do you know the definition of \(\cot(\theta)\)?

Answer 3

you could change everything to sin and cos
and then use
sin(A-B)= sin A cos B - cos A cos B
and
cos(A-B) = cos A cos B + sin A sin B
and also remember
sin pi/2 = 1
cos pi/2 = 0