MCQ
If $A =\{x: x=2 n, n \in N\}$, then which is true?
- A$1 \in A$
- B$0 \in A$
- ✓$4 \in A$
- D$\phi \in A$
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The value of $\cos1^\circ\cos2^\circ\cos3^\circ...\cos179^\circ$ is:
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