What is sin 120 degrees? - Socratic
2015年5月30日 · On the trig unit circle: sin 120 = sin (180 - 60) = sin 60 = sqrt3/2
What is $$\sin 120$$ degrees? - Toppr
show that sin 780 degree sin120 degree + cos240 degree sin390 degree = 1/2
How do you find the value of #sin120# using the double angle
2016年7月15日 · Use trig identity: sin 2a = 2sin a.cos a sin 120 = 2sin 60.cos 60 Trig table --> sin 60 = 1/2 and cos 60 = sqrt3/2.
How do you find the exact functional value sin(405°+120 ... - Socratic
2015年8月21日 · Find: sin (405 + 120) Ans: (sqrt6 - sqrt2)/4 sin (405 + 120) = sin (45 + 120) --> because 405 = 45 + 360 deg Apply the trig identity: sin (a + b) = sin a.cos b + sin b.cos a sin 45 = sqrt2/2 ; and cos 120 = -1/2 sin 120 = sqrt3/2 ; and cos 45 = sqrt2/2 sin (45 + 120) = (sqrt2/2)(-1/2) + (sqrt3/2)(sqrt2/2) = = (sqrt6 - sqrt2)/4 Check by …
How do you use a double-angle identity to find the exact value of …
2014年10月24日 · Since sin2theta=2sin theta cos theta, we have sin120^circ=2sin60^circcos60^circ=2cdot sqrt{3}/2 cdot 1/2=sqrt{3}/2. I hope that this was helpful.
How do you evaluate Sin 120? - Socratic
2016年6月26日 · How do you know if #sin 30 = sin 150#? How do you show that #(costheta)(sectheta) = 1# if #theta=pi/4#? See all questions in Trigonometric Functions of Any Angle
How do you find the exact functional value sin 405°+sin 120
2015年8月27日 · color(red)(sin(405) + sin(120) = (sqrt2+sqrt3)/2) > sin(405) = sin(360 + 45) The sine sum identity is: sin(A+B) = sinAcosB+cosAsinB ∴ sin(405) = sin(360)cos(45) + cos(360)sin(45) We can use the unit circle to work out the values.
Find the value of sin 120°+ cos 120°? - Socratic
2018年5月21日 · Find the value of sin 120°+ cos 120°? Trigonometry. 1 Answer. Mr. Hsia. May 21, 2018. √3 − 1 2. Explanation: sin120 + cos120 = √3 2 − 1 2.
The value of sin 120.? - Socratic
2018年3月14日 · The value of sin 120.? Trigonometry. 1 Answer Umer F. Mar 14, 2018 ...
Find the value ofsin 120^ {o} - Toppr
sin 120 o. View Solution. Q2. Find the values of the following: sin 120 o. View Solution. Q3. Find the ...