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Under rotation of axes through theta , x...

Under rotation of axes through `theta` , `x cosalpha + ysinalpha=P` changes to `Xcos beta + Y sin beta=P` then . (a) `cos beta = cos (alpha - theta)` (b) `cos alpha= cos( beta - theta)` (c) `sin beta = sin (alpha - theta)` (d) `sin alpha = sin ( beta - theta)`

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