please answer b part
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- ☆Area of rectangle
- (5x²+25cy+4y²) ( 2x²-2xy
- 10x⁴-10x³y+15x²y²-50x²y²+15x2y²+75xy³
- 10x⁴+12⁴+40x³-27 x²y²+67xy³
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