1. Be sure that your graphing calculator is in degree mode.
2. Press sin(
3. Press 72, )
4. Press Enter
The calculator shows: .9510565163
5. Round to .95
Answer: sin 72° = .95
90 degrees - 72 degrees = 18 degrees -------------------
Sin(X) = 0.9 X = Sin^(-1) 0.9 X = 64.158... degrees.
72 degrees is an acute angle
sin(90) = 1
sin(360+30) =sin(30)= 1/2
It 2*pi/5 radians or 72 degrees.
The statement of the problem is equivalent to sin x = - cos x. This is true for x = 135 degrees and x = -45 degrees, and also for (135 + 180n) degrees, where n is any integer.
72 degrees F.72 degrees F.72 degrees F.72 degrees F.
tan(9) + tan(81) = sin(9)/cos(9) + sin(81)/cos(81)= {sin(9)*cos(81) + sin(81)*cos(9)} / {cos(9)*cos(81)} = 1/2*{sin(-72) + sin(90)} + 1/2*{sin(72) + sin(90)} / 1/2*{cos(-72) + cos(90)} = 1/2*{sin(-72) + 1 + sin(72) + 1} / 1/2*{cos(-72) + 0} = 2/cos(72) since sin(-72) = -sin(72), and cos(-72) = cos(72) . . . . . (A) Also tan(27) + tan(63) = sin(27)/cos(27) + sin(63)/cos(63) = {sin(27)*cos(63) + sin(63)*cos(27)} / {cos(27)*cos(63)} = 1/2*{sin(-36) + sin(90)} + 1/2*{sin(72) + sin(36)} / 1/2*{cos(-36) + cos(90)} = 1/2*{sin(-36) + 1 + sin(36) + 1} / 1/2*{cos(-36) + 0} = 2/cos(36) since sin(-36) = -sin(36), and cos(-36) = cos(36) . . . . . (B) Therefore, by (A) and (B), tan(9) - tan(27) - tan(63) + tan(81) = tan(9) + tan(81) - tan(27) - tan(63) = 2/cos(72) – 2/cos(36) = 2*{cos(36) – cos(72)} / {cos(72)*cos(36)} = 2*2*sin(54)*sin(18)/{cos(72)*cos(36)} . . . . . . . (C) But cos(72) = sin(90-72) = sin(18) so that sin(18)/cos(72) = 1 and cos(36) = sin(90-36) = sin(54) so that sin(54)/cos(36) = 1 and therefore from C, tan(9) – tan(27) – tan(63) + tan(81) = 2*2*1*1 = 4
90 - 18 = 72 degrees.90 - 18 = 72 degrees.90 - 18 = 72 degrees.90 - 18 = 72 degrees.
90 degrees - 72 degrees = 18 degrees -------------------
72 degrees each. There are 5 angles. You divide 360 degrees by 5 and get 72 degrees.
72 degrees Fahrenheit is equal to 22.22 degrees Celsius.
72 degrees Fahrenheit is approximately 22.2 degrees Celsius.
The sine of 57 degrees is approximately 0.8387.
all sin is sin97 degrees Fahrenheit = 36.1 degrees Celsius
Do you mean sin(x)=sqrt(3)/2? IF so, look at at 30/60/90 triangle. We see the sin 60 degrees is square (root of 3)/2