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May 25, 2018 · To find the exact value of cos(180o) −sin(180o) −1 − 0 = −1. Answer link. -1 Within the unit circle, cosine provides the x coordinate of a point on the surface of the circle. Sine provides the y coordinate of a point on the surface of the circle. At 180^o, the point on the unit circle surface is (-1,0). So this means: x=cos (180^o) = -1 ...
Jan 4, 2017 · Learn how to find the exact value of cos 180 with a step-by-step explanation on Socratic.org.
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 ...
Dec 25, 2016 · Dec 25, 2016. You can use a reduction formula. See explanation. Explanation: cos120=cos (180-60)=-cos60=-1/2. Answer link.
Oct 30, 2015 · 1 Answer. Trevor Ryan. cos(− 120∘) = cos120∘. = cos(180∘ − 60∘) = − cos60∘. = − 1 2. Note: Above I have used the 180∘ rule. Alternatively I could also have used the 90∘ rule, or the compound angle formulae for either sin or cos, or a number of other possible methods as well, and each would result in exactly the same final ...
May 20, 2016 · Answer link. pi=3.14159265... is a transcendental number. This is a limit problem of x to pi of cos x. cos x is continuous at x = pi. Both cos pi_+ and cos pi_ ( - ) approach to the same limit -1. The Calculator value of cos pi = cos 180^o = -1 is by truncation and rounding of (say) 10-sd -1.000000000 approximation obtained from an ...
Jul 14, 2016 · Prove trig expression Apply the trig identity: cos (a - b) = cos a.cos b + sin a.sin b cos (180 - a) = cos 180.cos a - sin 180.sin a Because sin 180 = 0, cos 180 = -1, there for: cos (180 - a) = - cos a.
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 ...
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
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 ...
