Does sin(pi-x) = sin(x)? - Socratic
2015年4月15日 · How do you use the sum and difference identities to find the exact value of tan 105 degrees
How do you verify the identity sin(A+pi)=-sinA? - Socratic
2018年5月18日 · There are multiple ways of proving the identity. Please, see below. First way, probably the more direct method, is by the unit circle: We see that, if we add pi to some angle …
How do I evaluate sin(pi/3) without using a calculator?
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 …
How do you find the exact value of #sin (pi/12)#? - Socratic
2016年4月11日 · We want to find replacement angles for # pi/12" that will produce exact values " #. These must come from : # pi/6 , pi/3 , pi/4 #
How do you evaluate #sin(pi/5)#? - Socratic
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 …
How do you evaluate sin(π/4)? - Socratic
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 …
How do you evaluate #sin(pi/6) - Socratic
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 …
Prove the identity. sin (pi+x)=-sinx Have to show the ... - Socratic
2018年4月7日 · Prove the identity. #sin(pi+x)=-sinx# Have to show the statements and the rules?
Fundamental Identities - Trigonometry - Socratic
"The fundamental trigonometric identities" are the basic identities: •The reciprocal identities •The pythagorean identities
What is the value of Sin^2 (pi/2) - cos (pi)? - Socratic
2016年7月13日 · sin^2(pi//2)-cos(pi) = 1 - (-1) = 2 To solve this, we need to know the values of the sin and cos functions at specific angles. One of the simplest ways to look at this is using the …