195 = 150 + 45 and 195 = 240 - 45 So we will be able to get an answer in two ways: tan(195) tan(150+45) Using the formula we get: We should be able to find these tan's easily since they are all special angles: which simplifies as follows: Multiplying the numerator and denominator by 3: Rationalizing the denominator: Another solution using 240 ...

2015年6月15日 · tan(195^o) = tan(390^o/2) The identity you need is: tan(x/2) = pmsqrt((1-cosx)/(1+cosx)) + if quadrant I or III - if quadrant II or IV It's derived from: sin(x/2) = pmsqrt((1-cosx)/2) + if quadrant I or II - if quadrant III or IV cos(x/2) = pmsqrt((1+cosx)/2) + if quadrant I or IV - if quadrant II or III Divide the quadrant conditions …

2015年9月19日 · Fin tan (-195) Ans: sqrt3 - 2 Call tan (-195) = t tan (- 390) = 2t = tan (-30 - 360) = tan (-30) = - tan (30) = - 1/sqrt3 Apply trig identity: tan 2t = (2t)/(1 - t^2 ...

2015年5月23日 · Use the trig identity: tan 2a = (2tan a)/(1 - tan^2 a) tan 2(195) = tan 390 = tan (30 + 360) = tan 30 = sqrt3/3 Call t = tan 195. sqrt3/3(1 - t^2) = 2t --> (1 - t^2) = 2sqrt3t -> t^2 + 2sqrt3 - 1 = 0 D = d^2 = 12 + 4 = 16 --> d = +- 4 t = tan 195 = (- 2sqr3)/2 + 4/2 = (2 - sqrt3) t = tan 195 = - sqrt3 - 4 = -5.414 Rejected because arc 195 is on Quadrant III. Its tan must be positive.

tan 195 degrees Answer by arallie(162) (Show Source): You can put this solution on YOUR website! 0. ...

How do you use the sum and difference identities to find the exact value of tan 105 degrees? How do you apply the sum and difference formula to solve trigonometric equations? How do you evaluate #sin(45)cos(15)+cos(45)sin(15)#?

How would you use the half-angle formula to find the exact values of #tan 195#degrees? How do you use the half angle formula to simplify #sin^2(pi/8)#? How do you use the half angle identity to solve sin 165°, cos 165° and tan 165° ?

tan(-11pi/12) 2. 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.

2015年5月23日 · On the trig unit circle, tan (-195) = tan (180 - 15) = - tan 15 . Answer link. Related questions

Without using calculator or table of multiplication, show that #tan 195° = (sqrt3-1)/(sqrt3+1)#.?