I second this. Next time just look at the two equations and try to see any resemblance. Then you might find some. In here you might see x=Cos(theta) directly whereas you might see Sin(theta)= SqRt(1-x^2).tommyxu3 said:Just let ##x=\cos \theta.## Then by ##\sin^2 \theta+\cos^2 \theta =1,## you can get what you want.
To solve for a variable in an equation, you can use algebraic manipulation. This involves performing the same operation on both sides of the equation to isolate the variable on one side.
An equation is a mathematical statement with an equals sign, while an expression is a combination of numbers, variables, and operations. Equations can be solved to find the value of a variable, while expressions cannot.
The order of operations in equations follows the acronym PEMDAS: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).
To check if your solution to an equation is correct, you can substitute the value of the variable into the original equation and see if it satisfies the equation. If it does, then your solution is correct.
To solve a multi-step equation, you need to use the order of operations and perform the same operation on both sides of the equation to isolate the variable. This may involve using inverse operations to undo any operations that are being performed on the variable. The goal is to get the variable by itself on one side of the equation.