Find sin4a and cos4α, if tanα=3

Step-by-step explanation:

Sin2α = 2SinαCosα.

Cos2α = (Cosα)^2 - (Sinα)^2.

Sin4α can be written as Sin2(2α).

Similarly Cos4α can be written as Cos2(2α).

It is given that  tanα=3.

Sinα(Sinα) =   [], the values either be both positive or both negative, as the value of tanα is positive only on first and third quadrant.

Sin4α = .

Cos4α =