For cos 90 degrees, the angle 90° lies on the positive y-axis. Thus cos 90° value = 0. Since the cosine function is a periodic function, we can represent cos 90° as, cos 90 degrees = cos (90° + n × 360°), n ∈ Z. ⇒ cos 90° = cos 450° = cos 810°, and so on. Note: Since, cosine is an even function, the value of cos (-90°) = cos (90
What Are Sin Cos Formulas? If (x,y) is a point on the unit circle, and if a ray from the origin (0, 0) to (x, y) makes an angle θ from the positive axis,
sin: sine of a value or expression : cos: cosine of a value or expression : tan: tangent of a value or expression : asin: inverse sine (arcsine) of a value or expression : acos: inverse cosine (arccos) of a value or expression : atan: inverse tangent (arctangent) of a value or expression : sinh: Hyperbolic inverse sine (arcsine) of a value or
I attached an image but just in case it doesn't show up properly, the prompt is to write $$\frac{\csc(x)\cot(x)}{\sec(x)}$$ in terms of sine and cosine. What I don't understand is that the prompt is to write the answer in terms of sine and cosine but the answer when I checked is B, or $\cot^2(x)$.
Beware - the notation cos-1 have two very different meanings: cos-1 (x) = 1/cos (x), i.e., the multiplicative inverse of cos (x); or. cos-1 (x) = arccos (x), i.e., the inverse function of the cosine. In other words, we have the problem of determining the angle whose cosine equals x. We assume that you have in mind the inverse cosine.
If you want to find the approximate value of cos x, you start with a formula that expresses the value of sin x for all values of x as an infinite series. Differentiating both sides of this formula leads to a similar formula for cos x: Now evaluate these derivatives: Finally, simplify the result a bit: As you can see, the result is a power series.
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what is cos x sin
