1.

Find the interval in which ∣∣∣∣cosxsinx1sinxcosx1cos(x+y)sin(x−y)0∣∣∣∣ lies.

Answer» Find the interval in which ∣∣
∣
∣
cosxsinx1sinxcosx1cos(x+y)sin(x−y)0∣∣
∣
∣
lies.


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