The angles A, B,C, D of a quadrilateral ...

The angles A, B,C, D of a quadrilateral ABCD are in the ratio 1:2:4:5.
Consider the following statements :
1. ABCD is a cyclic quadrilateral.
2. sin (B - A) = cos (D - C).
Which of the above statements is/are correct ?

A

1 only

B

2 only

C

Both 1 and 2

D

Neither 1 nor 2

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