2016年2月11日 · sqrt(2)/2 In the trigonometric circle pi/4 is the bisectrix between 0 and pi/2, where x=y. By the Pythogoras theorem we know that x^2+y^2=1. If you don't know the …

2018年1月11日 · sin(pi/6) = 1/2 Start with an equilateral triangle of side 2. The interior angle at each vertex must be pi/3 since 6 such angles make up a complete 2pi circle. Then bisect the …

2016年7月31日 · How do you evaluate #sin(45)cos(15)+cos(45)sin(15)#? How do you write #cos75cos35+sin75sin 35# as a single trigonometric function? How do you prove that #cos(x …

2015年4月15日 · sin(pi-x) = sin pi cosx -cos pi sinx color(white)"sssssssssss" =(0) cos x - (-1)sinx color(white)"sssssssssss" =sinx Yes.

2016年4月11日 · Apply the trig identity: #cos 2a = 1 - 2sin^2 a# #cos ((2pi)/12) = cos (pi/6) = sqrt3/2 = 1 - 2sin^2 (pi/12)# ...

2016年11月16日 · How do you know if #sin 30 = sin 150#? How do you show that #(costheta)(sectheta) = 1# if #theta=pi/4#? See all questions in Trigonometric Functions of …

2017年2月27日 · sin (pi/8) = sqrt(2 - sqrt2)/2 Use trig identity: 2sin^2 a = 1 - cos 2a In this case, a = pi/8 and 2a = pi ...

2016年7月2日 · sin(pi/5)=sqrt(10-2sqrt5)/4 Let theta=pi/5, then 5theta=pi and 3theta=pi-2theta. Note theta) is an acute angle. Hence sin3theta=sin(pi-2theta) but as sin(pi-A)=sinA This can …

2015年8月8日 · sin (5pi)/6= 1/2 Sin (5pi)/6= sin (pi- pi/6)= sin pi/6= sin 30 = 1/2 Another way to think about it is to draw the angle in a Unit circle and create the "new" triangle in Quadrant II. …

2015年8月29日 · sin(pi/3) = sqrt(3)/2 Consider the series of diagrams below. The interior angles of a triangle always add up to pi radians An equilateral triangle will have all three angles = pi/3 …