Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\sin ^ { - 1 } x + \sin ^ { - 1 } y = \pi / 2 , \cos ^ { - 1 } x + \cos ^ { - 1 } y$$

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