If `A` is the void set `varphi` then `P(A)` has just one element `varphi` i.e. `P(varphi)={varphi}` .

n{P(P(P(varphi)))}=

How many elements has P(A), if A =varphi ?

How many elements has P(A), if A =varphi ?

How many elements has (A),\ if\ A=varphi?

If tan theta=(1)/(2) and tan varphi=(1)/(3) then the value of theta+varphi is

How many elements has (A),quad if quad A=varphi?

Evaluate: int_(pi/4)^((3pi)/4) varphi/(1-sinvarphi)d varphi

Evaluate: int_(pi/4)^((3pi)/4) varphi/(1-sinvarphi)d varphi

Prove that the product of matrices [cos^(2)theta cos theta sin theta cos theta sin theta s in^(2)theta] and [cos^(2)varphi cos varphi sin varphi cos varphi sin varphi s in^(2)varphi] is the null matrix,when theta and varphi differ by an odd multiple of (pi)/(2) .

If 3tanthetatanvarphi=1 , then prove that 2cos(theta+varphi)=cos(theta-varphi) .