Question

prove it..
...............................​

Answer 1

Step-by-step explanation:

1/tan3A-tanA-1/cot3A-cotA

=1/(sin3A/cos3A)-(sinA/cosA) -1/(cos3A/sin3A)-(cosA/sinA)

=cosAcos3A/sin3AcosA-cos3AcosA -sinAsin3A/cos3AsinA-cosAsin3A

=cosAcos3A/sin(3A-A)-sinAsin3A/sin(A-2A)

=cosAcos3A/sin2A+sinAsin3A/sin2A

=cosAcos3A+sinAsin3A/sin2A

=cos(A-3A)/sin2A

=cos2A/sin2A

=cot2A

Answer 2

Answer:

Step-by-step explanation:mark me if you can i needed

The answer is here,

Given that,

= > \: \frac{a + ib}{c + id} = p + iq

We can replace the " i " as " -i ".

= > \frac{a - ib}{c - id} = p - iq