Q:

# What is sine squared plus cosine squared?

A:

The sum of sine squared plus cosine squared is 1. While the sine is calculated by dividing the length of the side opposite the acute angle by the hypotenuse, the cosine is calculated by dividing the length of the side that is adjacent to the acute angle by the hypotenuse.

## Keep Learning

For example, the sine of a 30-degree angle is 1/2 and the cosine of a 30-degree angle is the square root of 3/2. One-half squared is equal to 1/4, and the square of the square root of 3/2 is equal to 3/4. When added together, 1/4 plus 3/4 equals 1.

Sources:

## Related Questions

• A: The periods of the trigonometric functions sine and cosine are both 2 times pi. The functions tangent and cotangent both have a period of pi. The general f... Full Answer >
Filed Under:
• A: The cosine function is one of the three basic functions used in trigonometry. The cosine of a right triangle is found by taking the ratio of the length of ... Full Answer >
Filed Under:
• A: The inverse secant of a non-zero real number x is equal to the inverse cosine of the quantity 1/x. Most scientific and graphic calculators have the inverse... Full Answer >
Filed Under:
• A: The integral of tan(x) is -ln |cos x| + C. In this equation, ln indicates the function for a natural logarithm, while cos is the function cosine, and C is ... Full Answer >
Filed Under:
PEOPLE SEARCH FOR