Parentheses are used to change the order of operations of an expression. For example,
2+2*2 is 6, since multiplication is performed before addition. However,
(2+2)*2 is 8, since the addition is performed before multiplication.
A closing parenthesis is also often used to end a function call. Like
√(4+5 is 3, but
√(4)+5 is 7.
for left one
for right one