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




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