Question

$(1 - x ^{2} )(1 - y ^{2} ) + 4xy$
​

Answer 1

Step-by-step explanation:

$(1 - {x}^{2} )(1 - {y}^{2} ) + 4xy \\ 1(1 - {y}^{2} ) - {x}^{2} (1 - {y}^{2} ) + 4xy \\ 1 - {y}^{2} - {x}^{2} + {x}^{2} {y}^{2} + 4xy \\ {x}^{2} {y}^{2} - {x}^{2} - {y}^{2} + 4xy + 1$

please make it brainly answer

Answer 2

$\Large\frak{\underline{\underline{Answer:}}}$

Step-by-step explanation:

$(1 - {x}^{2} )(1 - {y}^{2} ) + 4xy \\ 1(1 - {y}^{2} ) - {x}^{2} (1 - {y}^{2} ) + 4xy \\ 1 - {y}^{2} - {x}^{2} + {x}^{2} {y}^{2} + 4xy \\ {x}^{2} {y}^{2} - {x}^{2} - {y}^{2} + 4xy + 1$