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We can multiply the polynomials $\left(1+\sin\left(x\right)\right)\left(1+\sin\left(-x\right)\right)$ by using the FOIL method. The acronym F O I L stands for multiplying the terms in each bracket in the following order: First by First ($F\times F$), Outer by Outer ($O\times O$), Inner by Inner ($I\times I$), Last by Last ($L\times L$)
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$\begin{matrix}(F\times F)\:=\:(\sin\left(x\right))(\sin\left(-x\right))\\(O\times O)\:=\:(\sin\left(x\right))(1)\\(I\times I)\:=\:(1)(\sin\left(-x\right))\\(L\times L)\:=\:(1)(1)\end{matrix}$
Learn how to solve simplify trigonometric expressions problems step by step online. Expand and simplify the trigonometric expression (1+sin(x))(1+sin(-x)). We can multiply the polynomials \left(1+\sin\left(x\right)\right)\left(1+\sin\left(-x\right)\right) by using the FOIL method. The acronym F O I L stands for multiplying the terms in each bracket in the following order: First by First (F\times F), Outer by Outer (O\times O), Inner by Inner (I\times I), Last by Last (L\times L). Then, combine the four terms in a sum. Substitute the values of the products. Multiply 1 times 1.