Solving a trigonometric equation with an undefined answer of cosine

What is the first step in solving a quadratic equation using the zero product property?

• Combine like terms

• Factor the equation

• Use inverse operations

• Apply the quadratic formula

When applying the zero product property to trigonometric functions, what is a crucial tool for finding solutions?

• Pythagorean theorem

• Law of cosines

• Unit circle

• Sine rule

Why can't we find an angle for cosine when the value is greater than -1?

• It is not a real number

• It is not a valid trigonometric function

• It is outside the range of the unit circle

• It is undefined in mathematics

Which of the following is a valid solution for cosine of X equals zero?

• π

• 2π

• π / 2

• π / 4

What is the distance between the angles where cosine of X equals zero?

• π / 2

• π / 4

• π

• 2π