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.
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TRIGONOMETRIC FUNCTIONS OF ANY ANGLE
tangent, cosecants, secant, cotangent.
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.
Assuming that means degrees, that's the same as -30 degrees. The sine of -30 degrees is exactly -0.5, the cosine is +root(3)/2, or about 0.866. You can deduce the remaining trigonometric functions from these; for example, tan(x) = sin(x) / cos(x).
A linear equation, when plotted, must be a straight line. Such a restriction does not apply to a line graph.y = ax2 + bx +c, where a is non-zero gives a line graph in the shape of a parabola. It is a quadratic graph, not linear. Similarly, there are line graphs for other polynomials, power or exponential functions, logarithmic or trigonometric functions, or any combination of them.