Common questions

Can you have a negative secant?

Can you have a negative secant?

In fact, as you can see from both the tables and the graph of the secant function, the secant value is negative for all angles for which the cosine is negative. Like the cosine function, the secant function returns positive values for angles in Quadrants I and IV, and negative values for angles in Quadrants II and III.

What quadrants is secant negative?

Since − 5 π 6 \displaystyle -\frac{5\pi }{6} −65π​ is in the third quadrant, where both x and y are negative, cosine, sine, secant, and cosecant will be negative, while tangent and cotangent will be positive.

Does secant graph have an amplitude?

The secant and cosecant have periods of length 2π, and we don’t consider amplitude for these curves. The cotangent has a period of π, and we don’t bother with the amplitude. When you need to do the graphs, you may be tempted to try to compute a lot of plot points.

What is the graph of the inverse secant function?

The graph of the inverse secant goes from the point (1,0) and moves upward, staying below the horizontal asymptote as the x-values go to positive infinity. It also comes from negative infinity along the x-axis above the horizontal asymptote, moving upward to the point (–1,π).

What is secant the opposite of?

The secant is the reciprocal of the cosine. It is the ratio of the hypotenuse to the side adjacent to a given angle in a right triangle.

Where is SEC negative?

The sign of sec(t) ⁡ matches the sign of cos(t) ⁡ and thus is positive in Quadrant I, negative in Quadrant II, negative in Quadrant III, and positive in Quadrant IV.

What is secant the inverse of?

What is inverse secant equal to?

The inverse secant function – arcsec So the inverse of sec is arcsec etc. When we see “arcsec A”, we interpret it as “the angle whose secant is A”. sec 60 = 2.000. Means: The secant of 60 degrees is 2.000. arcsec 2.0 = 60.

Is sec inverse always positive?

From the graph the slope of y = sec-1 x is always positive. We take the positive root in the denominator of the derivative formula.

Is there a way to graph a secant function?

How to Graph a Secant Function. You can graph a secant function f ( x) = sec x by using steps similar to those for tangent and cotangent. As with tangent and cotangent, the graph of secant has asymptotes. This is because secant is defined as.

Is the value of the secant function always negative?

At − π and π, the value of the cosine function is − 1, so the value of the secant function is also − 1. Over the intervals ( − 3π 2, − π 2) and (π 2, 3π 2) the cosine function is always negative, so the secant function is also always negative.

What is the amplitude of a secant graph?

The secant graphs go on unending or infinite in vertical directions. However, for some cases, given the equation y = α sec (βx – c) – d, the secant graph will have an amplitude of |α|. It means that one should multiply all points of the vertical axis (y-coordinates) in the graph by the value of α.

Can a secant function be represented as an infinite series?

The secant function, in common with other trigonometric functions, can be represented as an infinite series. The value returned by a trigonometric function for a given angle cannot be calculated using a simple algebraic formula.