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If a vector $\overrightarrow{A}$ makes an angle $\theta$ with x-axis, then:
Difficulty: Hard
A: 
$A_{x}=A\sin\theta$
B: 
$A_{x}=A\cos\theta$
C: 
$A=A_{x}\cos\theta$
D: 
$A=A_{x}\sin\theta$