Example

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

Question

$$H= \frac{ { 25 }^{ 2 } \sin { 30 }^{ 2 } }{ 2 \times 10 }$$

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