[SOLVED] Prove $\sin(A+B)\sin(A-B)=\sin^2A-\sin^2B$

• 2012-07-25 17:13:53
• El Bananero
• 43836 View
• 16 Score
• Tags:   trigonometry

[SOLVED] Inverse trigonometric function identity doubt: $\tan^{-1}x+\tan^{-1}y =-\pi+\tan^{-1}\left(\frac{x+y}{1-xy}\right)$, when $x<0$, $y<0$, and $xy>1$

• 2016-06-23 19:56:30
• Harsh Sharma
• 2346 View
• 4 Score
• Tags:   trigonometry

[SOLVED] Are $\mathrm{arccot}(x)$ and $\arctan(1/x)$ the same function?

• 2013-02-14 23:21:33
• Mark
• 11239 View
• 9 Score
• Tags:   trigonometry

[SOLVED] Proving trigonometric equation $\cos(36^\circ) - \cos(72^\circ) = 1/2$

• 2014-06-09 05:05:35
• xzatulx
• 2762 View
• 4 Score
• Tags:   trigonometry

[SOLVED] Solving trigonometric equations of the form $a\sin x + b\cos x = c$

• 2012-10-14 09:36:55
• rrqq
• 13142 View
• 15 Score
• Tags:   trigonometry

[SOLVED] Prove that $\sin(2A)+\sin(2B)+\sin(2C)=4\sin(A)\sin(B)\sin(C)$ when $A,B,C$ are angles of a triangle

• 2012-06-06 01:14:44
• E.O.
• 19042 View
• 17 Score
• Tags:   trigonometry