21 Let z1 = 1+ 5i and z2 = 3+2i, and let z = 22 (a) Find |z| without finding z. -1 (b) Find tan(tan-5 – tan (c) Hence write z in the form x + iy, where x and y are real. ), and hence find arg z without finding z.

Q: What is the exact value of 2sin(x/2) * cos(x/2) if sin of x = 3/5 and cos of x = 4/5 ?

A: To determine the exact value of the expression.

Q: if sin(A)=3/5 A is in QII and tan(B)=7/24 B is in Q3 then determine tan(A+B) and cot(A+B)

A:

Q: SinA (1+cos A) = 2cosecA (+cos A) sin A

A:

Q: 1-tan20 = 1- 2sin?0 1+tan20

A: 1-tan2θ1+tan2θ=1-2sin2θ Formulas 1+tan2θ=sec2θ1-cos2θ=sin2θ 1secθ=cosθ

Q: rewrite cos(x+4pi/3) in terms of sin(x) and cos(x)

A: