Apr 11, 2016 · 1/2 sqrt3 >Using the appropriate color (blue)" Addition formula " color (red) (|bar (ul (color (white) (a/a)color (black) (cos (A +- B)= cosAcosB ∓ sinAsinB )color (white) (a/a)|))) rArr cos (pi/3 - pi/6) = cos (pi/3)cos (pi/6) + sin (pi/3)sin (pi/6) Now using the color (blue)" exact value triangle " with angles of pi/6 , pi/3 , pi/2" and ...

Dec 14, 2016 · How do you simplify 3(cos(π 6) + i sin(π 6)) ÷ 4(cos(2π 3) + i sin(2π 3)) and express the result in rectangular form?

Sep 24, 2016 · It is 1, only when -sinx=1 i.e. x= (3pi)/2 As cos (A+B)=cosAcosB-sinAsinB and cos (A-B)=cosAcosB+sinAsinB Hence cos (A+B)-cos (A-B)=-2sinAsinB Hence cos (x+pi/6)-cos (x-pi/6)=-2sinxsin (pi/6) = -2sinx xx1/2=-sinx Hence cos (x+pi/6)-cos (x-pi/6)=-sinx and not 1.

Apr 7, 2016 · Zero Apply the trig identity: cos (a - b) = cos a.cos b + sin a.sin b cos ( (2pi)/3 - pi/6) = cos ( (2pi)/3).cos (pi/6) + sin ( (2pi)/3).sin (pi/6) Trig table gives --> cos ( (2pi)/3) = -1/2 ; cos (pi/6) = sqrt3/2 sin ( (2pi)/3) = sqrt3/2 ; sin (pi/6) = 1/2.

Mar 1, 2017 · How do you find all solutions of the equation cos(x + π 6) − cos(x − π 6) = 1 in the interval [0, 2π)?

Dec 5, 2016 · Let z1 = 2[cos(π 6) + i sin(π 6)] How do you find 1 z1?

Mar 17, 2018 · How do you find the exact value of the following using the unit circle 6 cos (11pi/6) - 2 sin^2 (5pi/4)?

Jul 15, 2018 · As below. (pi/6)^c = (pi/6) * (180/pi) = 30^@ cos (pi/6)^c = cos (30)^@ In the above special right triangles, "Angles are " 30^@, 60^@, 90^@ " and the sides are "a, a ...

Jul 15, 2016 · How do you simplify cos(2 π 3)cos(π 6) + sin(2 π 3)cos(π 6)?

Apr 1, 2016 · How do you express cos(4π 3) ⋅ cos(π 6) without using products of trigonometric functions?