Example

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

Question

$$\sin^{2}a.\cos^{2}\beta-\cos^{2}\alpha.\sin^{2}\beta=\sin^{2}\alpha-\sin^{2}\beta$$

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