WebApr 28, 2015 · Zor Shekhtman. Apr 28, 2015. First of all, recall the definition of sec: sec(α) = 1 cos(α) To determine cos( 3π 2), recall the definition of cos based on a concept of a unit circle: cos(α) is an abscissa (X-coordinate) of a point on a unit circle, which radius makes an angle α with a positive direction of the X-axis, counting from that ... WebApr 13, 2024 · Explanation: As you can see in the table above, cos45∘ or cosπ 4 radians is the same thing as √2 2. An alternative way is looking at the unit circle: We know that the cosine of an angle is the x -value of a …
sec((pi)/4) - symbolab.com
WebJan 2013 - Oct 20152 years 10 months. 1600 East Golf Road, Des Plaines, IL 60016. • Assisted Students and staff members with technical support in person and over the phone. • Answered ... Web7 years ago. You have to know that sin (30 degrees) = sin (pi/6) is 1/2. This is the only trig function you have to memorize. Then, from the Pythagorean theorem, cos (30) is rt (3)/2. You can figure out sin (45) (see this video). From these you can get all the 12 simplest angles on the unit circle (8 multiples of 30 deg, 4 multiples of 45 (plus ... campgrounds and cabins in dallas texas
Graph of y=sin(x) (video) Trigonometry Khan Academy
WebFeb 1, 2024 · The six trigonometric functions are sine and cosine (denoted sin \sin sin and cos \cos cos), tangent and cotangent (tan \tan tan and cot \cot cot), and secant and cosecant (sec \sec sec and csc … WebIn this video, we will learn to find the value cosec(3pi/4).The link of the video explaining the proof of the identity cosec(pi/2 + x) = -sec x has been give... WebBecause the circumference of a circle is 2πr.Using the unit circle definition this would mean the circumference is 2π(1) or simply 2π.So half a circle is π and a quarter circle, which would have angle of 90° is 2π/4 or simply π/2.You bring up a good point though about how it's a bit confusing, and Sal touches on that in this video about Tau over Pi. first time hosting christmas