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Jun 5, 2015 · How do you use a double-angle identity to find the exact value of sin 120°? How do you use double angle identities to solve equations? How do you find all solutions for #sin 2x = cos x# for the interval #[0,2pi]#?
Dec 25, 2016 · How do you find the value of #cos 120#? Trigonometry Trigonometric Identities and Equations Double Angle Identities. 1 Answer
Jul 10, 2015 · sin120=sqrt(3)/2 cos120=-1/2 tan120=-sqrt(3) ctg120=-sqrt(3)/3 sec120=-2 csec120=(2sqrt(3))/3 To calculate sin120 and cos120 you can use the reduction formula, which says, that sin(180-x)=sinx and cos(180-x)=-cosx Rest of the functions can be calculated as: tanx=sinx/cosx ctgx=1/tanx secx=1/cosx csecx=1/sinx
May 21, 2018 · (sqrt(3) - 1)/2 sin 120 + cos 120 = sqrt(3)/2 - 1/2 = (sqrt(3) - 1)/2. What are the units used for the ideal gas law?
Jan 18, 2016 · Assuming that the angle is in degrees. sin(120^o) = sqrt(3)/2 cos(120^o) = -1/2 tan(120^o) = -sqrt3 csc(120^o) = 2/sqrt(3) sec(120^o) = -2 cot(120^o) = -1/sqrt(3) Trigonometry Science
One such trigonometric identity is the double angle identity for cosine, which we can use to find the exact value of cos(120°). Answer and Explanation: The exact value of cos(120°) is -1/2.
Apr 27, 2018 · How do you use the sum and difference identities to find the exact value of tan 105 degrees? How do you apply the sum and difference formula to solve trigonometric equations? How do you evaluate #sin(45)cos(15)+cos(45)sin(15)#?
(u is in Quadrant I and v is in Quadrant III.) cos(u - v) Find the exact value of the trigonometric function when sin u = 4/5 and cos v = -7/25 (u is in Quadrant I and v is in Quadrant III.) sin(u + v) Use the angle in the unit circle to find the exact value of sin(t). Find the exact value of sin 165 degrees without using a calculator.
Apr 28, 2018 · Its coordinates, regardless of where on the circle it may be, can always be expressed as: A (costheta, sintheta) There are certain commonly used angles in trigonometry, such as 30^@, 45^@, 60^@, 90^@, 120^@, etc. that you need to memorize what their coordinates are on the unit circle.
Nov 5, 2015 · Learn how to use basic angles, radians and the unit circle to find cos (2π/3) = -1/2. See the explanation, answer and link to more trigonometry topics on Socratic.
