2015年7月15日 · Find sin 105. Answer: sin (105) = +- sqrt(2 + sqrt3)/2 Call sin 105 = sin t cos (210) = cos (2t) = cos (30 + 180) = - cos (30) = (-sqrt3)/2 Apply the trig identity ...

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)#?

2015年6月6日 · sin -105 = - sin 105 cos 210 = cos (30 + 180) = - cos 30 = -(sqrt3)/2 2sin^2 105 = 1 - cos 210 = 1 + 0.866 ...

2017年6月1日 · Click here 👆 to get an answer to your question ️ Evaluate : cos 105* + sin 105*

2024年1月25日 · The value of sin 105 degrees in decimal is 0.965925826. . .. Sin 105 degrees can also be expressed using the equivalent of the given angle (105 degrees) in radians (1.83259 . . .). t h a nk uhh . . . hope it helps uhh : )

2015年7月16日 · Find sin (-105) Answer: sin -105 = +- sqrt(2 + sqrt3)/2 Call sin (-105) = sin t --> cos (-210) = cos (2t) On the trig unit circle, cos 2t = cos (-210) = cos (-30 ...

What is sin 105°+cos 105° equal to? - 3431401. kanchan48 kanchan48 26.04.2018 Math Secondary School ...

2015年8月4日 · Find cos 105 Ans: (2 - sqrt3)/2 cos 105 = cos (15 + 90) = - sin 15 cos 30 = sqrt3/2 = 1 - 2sin^2 (15) 2sin^2 15 = (2 - sqrt3)/2 sin^2 15 = (2 - sqrt3)/4 --> sin 15 = +- (2 - sqrt3)/2 Since the arc 15 is in Quadrant I, therefor, only the positive answer is accepted. cos 105 = - sin 15 = - (2 …

2020年7月18日 · Value of sin(105) in fraction - 19713687

2015年9月11日 · Find sin 285 Ans: - sqrt(2 + sqrt3)/2 csc 285 = 1/sin 285. Find sin 185 sin 285 = sin (105 + 180) = - sin 105 = - sin (15 + 90) = - cos 15 Find cos 15. Apply the trig identity: cos 2a = 2cos^2 a - 1 cos 30 = sqrt3/2 = 2cos^2 15 - 1 2cos^2 15 = (2 + sqrt3)/2 cos^2 15 = (2 + sqrt3)/4 cos 15 = +- sqrt(2 + sqrt3)/2 Since the arc 285 is located in Quadrant IV, its sine is negative, …