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  2. socratic.org › questions › what-is-sin-120-degreesWhat is sin 120 degrees? - Socratic

    May 30, 2015 · On the trig unit circle: sin 120 = sin (180 - 60) = sin 60 = sqrt3/2

  3. socratic.org › questions › how-do-you-find-the-value-of-sin120-using-the-doubleHow do you find the value of - Socratic

    Jul 15, 2016 · 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.

  4. socratic.org › trigonometry › trigonometric-identities-and-equationsDouble Angle Identities - Trigonometry - Socratic

    Answer: As below. Explanation: Following table gives the double angle identities which can be used while solving the equations. You can also have sin 2theta, cos 2theta expressed in terms of tan theta as under. sin 2theta = (2tan theta) / (1 + tan^2 theta) cos 2theta = (1 - tan^2 theta) / (1 + tan^2 theta) sankarankalyanam · 1 · Mar 9 2018.

  5. socratic.org › questions › find-the-value-of-sin-120-cos-120Find the value of sin 120°+ cos 120°? - Socratic

    May 21, 2018 · Find the value of sin 120°+ cos 120°? Trigonometry. 1 Answer Mr. Hsia May 21, 2018 ...

  6. socratic.org › questions › how-do-you-find-the-6-trig-functions-of-120-degreesHow do you find the 6 trig functions of 120 degrees? - Socratic

    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

  7. socratic.org › questions › how-do-you-evaluate-sin-120How do you evaluate Sin 120? - Socratic

    Jun 26, 2016 · 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

  8. socratic.org › questions › how-do-you-use-a-double-angle-identity-to-find-theHow do you use a double-angle identity to find the exact value of...

    Oct 24, 2014 · 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.

  9. socratic.org › questions › the-value-of-sin-120The value of sin 120.? - Socratic

    Mar 14, 2018 · The value of sin 120.? Trigonometry. 1 Answer Umer F. Mar 14, 2018 ...

  10. socratic.org › questions › how-do-you-find-the-exact-functional-value-sin-405-120How do you find the exact functional value sin(405°+120 ... -...

    Aug 21, 2015 · 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 calculator: sin (45 + 120) = sin 165 = 0.26 (sqrt6 - sqrt2)/4 = 0.26 OK

  11. socratic.org › questions › prove-that-cos120-cos240-sin240-sin120-1Prove that: cos120 cos240 - sin240 sin120 = 1 - Socratic

    Feb 23, 2018 · Please see below. We know that, cos(A+B)=cosAcosB-sinAsinB So, cos240°*cos120°-sin240°*sin120°=cos(240°+120°)=cos360°=1

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