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The fourth series of the British drama series Merlin began on 1 October 2011 with the episode "The Darkest Hour - Part 1". It consists of 13 episodes originally shown on Saturday evenings on BBC One and BBC One HD (repeats shown on BBC Three). The series producer was Sara Hamill, and executive producers were Johnny Capps and Julian Murphy.
The values of sine and cosine of 30 and 60 degrees are derived by analysis of the equilateral triangle. In an equilateral triangle, the 3 angles are equal and sum to 180°, therefore each corner angle is 60°. Bisecting one corner, the special right triangle with angles 30-60-90 is obtained.
Draw a horizontal line (the x-axis); mark an origin O. Draw a line from O at an angle above the horizontal line and a second line at an angle above that; the angle between the second line and the x-axis is +.
Quadrant 3 (angles from 180 to 270 degrees, or π to 3π/2 radians): Tangent and cotangent functions are positive in this quadrant. Quadrant 4 (angles from 270 to 360 degrees, or 3π/2 to 2π radians): Cosine and secant functions are positive in this quadrant. Other mnemonics include: All Stations To Central [6] All Silly Tom Cats [6]
In trigonometry, the law of cotangents is a relationship among the lengths of the sides of a triangle and the cotangents of the halves of the three angles. [1] [2]Just as three quantities whose equality is expressed by the law of sines are equal to the diameter of the circumscribed circle of the triangle (or to its reciprocal, depending on how the law is expressed), so also the law of ...
Ready, Steady, Wiggle! also referred to as The Wiggles TV Series 7 and The Wiggles TV Series 8 is a television series featuring the new Wiggles lineup of Emma Watkins, Lachlan Gillespie, Simon Pryce, and Anthony Field. Greg, Murray and Jeff also make occasional guest appearances in some episodes and videos.
The quantity 206 265 ″ is approximately equal to the number of arcseconds in a circle (1 296 000 ″), divided by 2π, or, the number of arcseconds in 1 radian. The exact formula is = (″) and the above approximation follows when tan X is replaced by X.
The fourth season, and the series, concluded on October 9, 2015. The premiere episode was released online by Showcase on August 21, 2015. [ 5 ] The series was created by Simon Barry , and centers on Kiera Cameron ( Rachel Nichols ) as she time travels from 2077 to 2012 in pursuit of a group of terrorists, attempting to find a way home.