# What is the relationship between sin and cos?

## What is the relationship between sin and cos?

Looking out from a vertex with angle θ, sin(θ) is the ratio of the opposite side to the hypotenuse , while cos(θ) is the ratio of the adjacent side to the hypotenuse . No matter the size of the triangle, the values of sin(θ) and cos(θ) are the same for a given θ, as illustrated below.

Are sin and cos reciprocals of each other?

The table below summarizes these relationships. The cosecant is the reciprocal of the sine. The secant is the reciprocal of the cosine.

### Is Cos equal to sin?

The cosine of an angle is defined as the sine of the complementary angle. The complementary angle equals the given angle subtracted from a right angle, 90°. For instance, if the angle is 30°, then its complement is 60°. cos θ = sin (90° – θ).

What is the difference between a sine and cosine wave?

A cosine wave and its corresponding sine wave have the same frequency, but the cosine wave leads the sine wave by 90 degrees of phase . In most practical situations, a lone cosine wave is the same as a lone sine wave; phase generally has meaning only when two or more waves having identical frequencies are compared.

## Are sin and cos ever equal?

Solution: In order for the sine and cosine to be equal, the angles must be complementary. cos (15º) = 0.97, find sin(75º) and the cos(75º). Solution: The sine of an angle and the cosine of its complement are equal.

Are cos and sine complementary?

You just verified the Complementary Angle Theorem: The sine of an angle is equal to the cosine of its complementary angle, and the cosine of an angle is equal to the sine of its complementary angle.

### Are sin and cos complementary?

What are cosine waves called?

A cosine wave is said to be sinusoidal, because. , which is also a sine wave with a phase-shift of π/2 radians.

## How are sine and cosine graphs similar?

The graphs of sine and cosine have the same shape: a repeating “hill and valley” pattern over an interval on the horizontal axis that has a length of . The sine and cosine functions have the same domain—the real numbers—and the same range—the interval of values .

When to use cosine or sine?

The sine rule can be used to find an angle from 3 sides and an angle, or a side from 3 angles and a side. The cosine rule can find a side from 2 sides and the included angle, or an angle from 3 sides. The trigonometric ratios sine, cosine and tangent are used to calculate angles and sides in right angled triangles.

### What is Sin divided by cosine?

Sine, Cosine and Tangent. The three main functions in trigonometry are Sine, Cosine and Tangent. They are just the length of one side divided by another. For a right triangle with an angle θ :

How is the sine related to the cosine?

Identities Reciprocal. The reciprocal of sine is cosecant, i.e., the reciprocal of sin (A) is csc (A), or cosec ( A ). Inverse. The usual principal values of the arcsin (x) function graphed on the Cartesian plane. Calculus Other trigonometric functions. The sine and cosine functions are related in multiple ways. Sine squared function.

## What does sine, cosine, and tangent actually do?

In this career, sine, cosine, and tangent are sometimes used to determine the size of large sea creatures from a distance, and also to calculate light levels at certain depths to see how they affect photosynthesis. There are dozens of careers that use trigonometry in their daily tasks.

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