You can put this solution on YOUR website! exact value of sin 255 sin (255)=sin(135+120)=sin135 cos120+cos135 sin120

2018年3月27日 · sin 255 = sin (75 + 180) = - sin 75. Find sin 75 by using the trig identity: sin (a + b) = sin a.cos b + sin b.cos a

2016年7月23日 · If sinA=4/5 and cosB= -5/13, where A belongs to QI and B belongs to QIII, then find sin(A+B).... See all questions in Sum and Difference Identities Impact of this question

2015年9月8日 · #sin(-255^@) = sin(105^@)# #color(white)("XXXXXXX")=cos(90^@-105^@) = cos(-15^@)# #color(white)("XXXXXXX")=cos(30^@-45^@)#

Question 1060238: Using the sum or difference formulas, find the exact value of sin(255°). Express your answer in the form sin(255°)=-sqrt(a)(sqrt(b)+1)/4 for some numbers a and b.

Here is an example of using a sum identity: Find #sin15^@#.. If we can find (think of) two angles #A# and #B# whose sum or whose difference is 15, and whose sine and cosine we know.

2015年9月6日 · Find sin (-255). sin (-255) = sin (105 - 360) = sin 105 = sin (15 + 90) = cos 15 Apply the trig identity: cos 2a = 2cos^2 a - 1 cos 30 = sqrt3/2 = 2cos^2 15 - 1 2cos^2 15 = 1 + sqrt3/2 = (2 + sqrt3)/2 cos^2 15 = (2 + sqrt3)/4 --> cos 15 = +- sqrt(2 + sqrt3)/2 Since cos 15 is positive, then sin (-255) = cos 15 = sqrt(2 + sqrt3)/2 csc (-255) = 1 ...

sin(-11pi/12) Algebra -> Trigonometry-basics -> SOLUTION: Use an Addition or Subtraction Formula to find the exact value of the expression, as demonstrated in Example 1. 1.

255 is in the third quadrant where the sin is negative: sin(255) = −0.9659: Answer by ikleyn(52305 ...

B. y=sin pi/255 theta C. y=sin 510/pi theta D. y=sin 255/pi theta Answer by htmentor(1341) (Show Source):