A function f(x) is even if:
f(x) = f(-x)
In layman's terms this property simply means that any real number in the domain and it's opposite will yield the same function value in the range.
To simplify this down even further, an even function, when graphed will appear to be symetric about the y-axis (assuming that you use the standard Cartesian coordinate plane).
In the case of trig functions, you would have to test whether the even function property holds true for each. We will the test points π, π/2, or π/4. NOTE: The # signs are present next to the functions that are even:
1. Sine: f(x) = sin(x)
-> sin(π/2) = 1, but sin(-π/2) = -1. Since 1 does not equal -1, sine is NOT an even function.
2. #Cosine: f(x) = cos(x)
-> cos(π) = -1 = cos(-π). Since both are equal, cosine IS an even function.
3. Tangent: f(x) = tan(x)
-> tan(π/4) = 1, but tan(-π/4) = -1. Therefore, tangent is NOT an even function.
4. Cosecant: f(x) = csc(x)
-> csc(π/2) = 1, but csc(-π/2) = -1. Therefore, cosecant is NOT an even function.
5. #Secant: f(x) = sec(x)
-> sec(π) = -1 = sec(-π). Since the secant function has asymptotes, it IS an even function provided that x does not equal π(2n+1)/2, where n may be all integers.
6. Cotangent: f(x) = cot(x)
-> cot(π/4) = 1, but cot(-π/2) = -1. Therefore cotangent is NOT even.
TRIGONOMETRIC FUNCTIONS OF ANY ANGLE
tangent, cosecants, secant, cotangent.
The six main trigonometric functions are sin(x)=opposite/hypotenuse cos(x)=adjacent/hypotenuse tan(x)=opposite/adjacent csc(x)=hypotenuse/opposite cot(x)=adjacent/opposite sec(x)=hypotenuse/adjacent Where hypotenuse, opposite, and adjacent correspond to the three sides of a right triangle and x corresponds to an angle in that right triangle.
It refers to one.A binary function (binary = 2) takes two numbers as input and gives the result (output) as a single number. Thus, addition is a binary function. Some functions, like squaring or trigonometric functions are examples of unary functions. These have only one input.
There are many families of functions or function types that have both increasing and decreasing intervals. One example is the parabolic functions (and functions of even powers), such as f(x)=x^2 or f(x)=x^4. Namely, f(x) = x^n, where n is an element of even natural numbers. If we let f(x) = x^2, then f'(x)=2x, which is < 0 (i.e. f(x) is decreasing) when x<0, and f'(x) > 0 (i.e. f(x) is increasing), when x > 0. Another example are trigonometric functions, such as f(x) = sin(x). Finding the derivative (i.e. f'(x) = cos(x)) and critical points will show this.
SineCosineTangentSecantCosecantCotangent
Cosine and secant are even trig functions.
There are three types of trigonometric functions, they are: 1- Plane Trigonometric Functions 2- Inverse Trigonometric Functions and 3- Hyperbolic Trigonometric Functions
The trigonometric functions give ratios defined by an angle. Whenever you have an angle and a side in right triangle, you can find all the other angles and sides using the six trigonometric functions and their inverses. The link below demonstrates the relationship between functions.
Sine Cosine Tangent ArcSine ArcCosine ArcTangent
All six trigonometric functions can take the value 1.
sine, cosine, tangent, cosecant, secant and cotangent.
All the trigonometric functions are derived from the right angled triangle. If we consider the three sides (AB, BC, CA) of a triangle and the included angle. There is a possibility of getting six functions based on the ratios like AB/AC, BC/AC, AB/BC, BC/AB, AC/BC, AC/AB . So we will have six trigonometric functions
TRIGONOMETRIC FUNCTIONS OF ANY ANGLE
With ease, I suppose. The question depends on what you consider easy trigonometric functions.
They are all one-to-one as they all pass the vertical line test.
There are several topics under the broad category of trigonometry. * Angle measurements * Properties of angles and circles * Basic trigonometric functions and their reciprocals and co-functions * Graphs of trigonometric functions * Trigonometric identities * Angle addition and subtraction formulas for trigonometric functions * Double and half angle formulas for trigonometric functions * Law of sines and law of cosines * Polar and polar imaginary coordinates.