12. Evaluate- icos xide

The flocculating power of the given ions for the specified colloidal sols will be such that: Arsenic sulphide sol Ferric hydro xide sol

((1+sin theta+icos theta)/(1+sin theta - icos theta))^(n)=

Suppose a, b, g and d are the interior angles of regular pentagon, hexagon, decagon and dodecagon, respectively, then the value of Icos a sec b cos g cosec dl is

If the complex numbers sinx+icos 2x and cosx-isin2x are conjugate of each other, then the number of values of x in the inverval [0, 2pi) is equal to (where, i^(2)=-1 )

If the complex numbers sinx+icos 2x and cosx-isin2x are conjugate of each other, then the number of values of x in the inverval [0, 2pi) is equal to (where, i^(2)=-1 )

Modulus of (cos theta-isin theta)/(sin theta-icos theta) is

Find the absolute values and arguments of the following complex numbers: (i) 3(cos60^(@)+isin60^(@)) (ii) "icos"(pi)/(6)+"sin"(pi)/(6) (iii) 1-costheta+isintheta .