Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ ¹ ² ³ °
 

You are not logged in. #1 20100511 15:59:50
Trigonometry(a) Express Sin2A + Sin2B as a product in Sine and Cosine. #2 20100511 16:04:01
Re: TrigonometryHi mickeen; b) If A + B + C = 180 then A + B = 180  C and sin( 180  c ) = sin(180° )cos(c)  cos(180° )sin(c) = sin(c) For c)
What does the underscore mean? In mathematics, you don't understand things. You just get used to them. I have the result, but I do not yet know how to get it. All physicists, and a good many quite respectable mathematicians are contemptuous about proof. #4 20100511 17:28:04
Re: TrigonometryHi mickeen; remember sin(C) = sin(A+B) See the result I gave you in post #6, Use it right here. Done! In mathematics, you don't understand things. You just get used to them. I have the result, but I do not yet know how to get it. All physicists, and a good many quite respectable mathematicians are contemptuous about proof. #6 20100511 18:26:44
Re: TrigonometryHi mickeen; Just say u = 2A and v = 2B And you get: In mathematics, you don't understand things. You just get used to them. I have the result, but I do not yet know how to get it. All physicists, and a good many quite respectable mathematicians are contemptuous about proof. #8 20100516 04:53:49
Re: TrigonometryHi mickeen; In mathematics, you don't understand things. You just get used to them. I have the result, but I do not yet know how to get it. All physicists, and a good many quite respectable mathematicians are contemptuous about proof. #9 20100518 06:46:10
Re: TrigonometryBobby M, #10 20100518 06:51:31
Re: TrigonometryHi mickeen; In mathematics, you don't understand things. You just get used to them. I have the result, but I do not yet know how to get it. All physicists, and a good many quite respectable mathematicians are contemptuous about proof. 