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May 25, 2018 · Sine provides the y coordinate of a point on the surface of the circle. At 180o, the point on the unit circle surface is (− 1,0). So this means: x = cos(180o) = − 1. y = sin(180o) = 0. To find the exact value of cos(180o) −sin(180o) −1 − 0 = −1. -1 Within the unit circle, cosine provides the x coordinate of a point on the surface of ...
Jan 4, 2017 · Learn how to find the exact value of cos 180 with a step-by-step explanation on Socratic.org.
Dec 25, 2016 · How do you find the value of #cos 120#? Trigonometry Trigonometric Identities and Equations Double Angle Identities. 1 Answer
May 23, 2016 · One of the easiest ways could be to use the formula. cos(A −B) = cosAcosB + sinAsinB. Hence, cos(180o − θ) = cos180ocosθ +sin180osinθ. = (− 1) × cosθ +0 ×sinθ. = −cosθ. Please see below. One of the easiest ways could be to use the formula cos (A-B)=cosAcosB+sinAsinB Hence, cos (180^o-theta)=cos180^ocostheta+sin180^osintheta ...
Oct 29, 2016 · As anything multiplied with 0 will be 0. cos1 cos2 cos 3 ....cos 180 = 0. Value of equation above is 0. because in this cos 90 is also being multiplied. since value of cos 90 is 0 so whole equation becomes 0. Cos1 cos2 cos 3 .... cos 180 = 0 Step-by-step explanation:The cos trigonometric function is positive in first and fourth quadrants in the ...
Sep 18, 2015 · Plug in the following values. tan 180 =0 cos 180= -1 csc 270= csc (360-90)= csc -90 =-csc 90 =-1. sin 90= 1. This would make 0-2-3+1= -4
How do you use the fundamental trigonometric identities to determine the simplified form of the expression? "The fundamental trigonometric identities" are the basic identities: •The reciprocal identities •The pythagorean identities •The quotient identities.
Jan 5, 2016 · But Since the #theta# is in between #180^o and 270^o #. i.e The angle #theta# is in #3rd# quadrant. Since #cos# is negative in #3rd# quadrant. Therefore, we take the negative value of #costheta# .
Mar 7, 2018 · Use the sum in cosine identity, cos(A+ B) = cosAcosB - sinAsinB. Thus we have: cos(180˚)cos(x) - sin(180˚)sinx = -cosx -1(cosx) - 0(sinx)= -cosx -cosx= -cosx LHS ...
May 16, 2018 · the answer comes from the fact that cos(30) = √3 2 and sin(30) = 1 2 are known values. cos (150) = -sqrt (3)/2 sin (150) = 1/2 First of all, observe that 150=180-30. Then, remember that we have cos (180-x) = -cos (x) sin (180-x) = sin (x) Plug in x=30 to get cos (180-30) = -cos (30) sin (180-30) = sin (30) the answer comes from the fact that ...
