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I. x=y II. 9(x+y)=pi III. cosx=cosy ...

I. `x=y`
II. `9(x+y)=pi`
`III. `cosx=cosy`
If `0ltx, ylt(pi)/(2)`, and sinx=cosy, then which of the statements above must be true?

A

I and II only

B

I and III only

C

II only

D

III only

Text Solution

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The correct Answer is:
B
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