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Derive:
![R = mg cos\theta R = mg cos\theta](https://tex.z-dn.net/?f=+R+%3D+mg+cos%5Ctheta)
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Explanation:
we can drive R = mg cos theta in the mannar as we drive
a = g sin theta of a inclined plan we know that R = W =mg
and also that the cos theta = B/H . so if we simplify that in the end we get
R = W cos theta
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