Problem to solve:
The sum of two terms multiplied by their difference is equal to the square of the first term minus the square of the second term. In other words: $(a+b)(a-b)=a^2-b^2$, where:
- The first term ($a$) is $\sin\left(x\right)$.
- The second term ($b$) is $\cos\left(x\right)$.
Solve the product $5\left(\sin\left(x\right)^2-\cos\left(x\right)^2\right)$