1.

In a quadrilateral ABCD, Let △=∣∣∣∣∣cosAsinAcos(A+D)cosBsinBcos(B+D)cosCsinCcos(C+D)∣∣∣∣∣, then △ is

Answer»

In a quadrilateral ABCD,
Let =

cosAsinAcos(A+D)cosBsinBcos(B+D)cosCsinCcos(C+D)

,
then is




Discussion

No Comment Found