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- can anyone explain why i divide degrees by radians

**I = I**_{0}[ sin (φ/2)/(φ/2)]^{2}Given such equation I don't understand why in

**are used**

*sin(φ/2)*__degrees__and in

**at the denominator**

*(φ/2)*__radians__. If there is any reason for it i forgot about it .

Is there any one so kind to explain to me why is like that?

Thanks in advance