19." If "a=(cos theta+i sin theta)," prove that "(1+a)/(1-a)=(cot(theta)/(2))i*quad 2log_((2))

If a=cos theta+i sin theta, then (1+a)/(1-a)=(cot theta)/(2) b.cot theta c.i(cot theta)/(2)d*i(tan theta)/(2)

If a=cos theta+i sin theta, then (1+a)/(1-a) is equal to ( i) cot((theta)/(2))( ii) cot theta( iii) i cot((theta)/(2))( iv )i tan((theta)/(2))

Prove that (1+cos theta)/(sin theta)=cot[(theta)/(2)]

(1+cos 2 theta)/(sin 2 theta)=cot theta

If z=(1)/(1-cos theta-i sin theta), then Re(z) is a.0 b.(1)/(2) c.cot((theta)/(2)) d.(1)/(2)cot((theta)/(2))

Prove that sin(2theta)/(1-cos2theta)=cot theta

If alpha=cos theta+i sin theta, then (1+alpha)/(1-alpha) equals ( (i)cot theta(ii)i tan((theta)/(2))(iii)i cot((theta)/(2))(iv)cot((theta)/(2))

Prove that: (sin2 theta)/(1-cos2 theta)=cot theta

Prove: (1+cos theta-sin^(2)theta)/(sin theta(1+cos theta))=cot theta

(sin 2 theta)/(1-cos 2 theta)=cot theta