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But I have this issue.

Consider a bob suspended from a string.The string is not perpendicular to the horizontal,but inclined at some angle(due some force,say it is in a non inertial frame).

Let the angle be theta(with the vertical).

So which of these is correct:

a) m*g*cos(theta)=T or

b) m*g=T*cos(theta).

Why?

I have seen both equations used in books.

Thank You.