Friday

April 18, 2014

April 18, 2014

Posted by **Cyndy** on Friday, August 3, 2012 at 3:39pm.

Please explain.

- Trigonometry -
**Steve**, Friday, August 3, 2012 at 3:55pmthere are many counterexamples. For instance,

sec(pi/4) - cos(pi/4) = √2 - 1/√2

sin(pi/4)*sec(pi/4) = 1/√2 * √2 = 1

not equal. In fact, for any alpha not a multiple of pi, they are not equal.

**Related Questions**

Trigonometry - 1.Solve tan^2x + tan x – 1 = 0 for the principal value(s) to two ...

trigonometry hlp me - 6.Prove that tan y cos^2 y + sin^2y/sin y = cos y + sin y...

Trigonometry desperate help, clueless girl here - 2. solve cos 2x-3sin x cos 2x...

trignonmetry - 6. Prove that tan λ cos^2 λ + sin^2λ/sin λ = ...

trig help much appreciated! :)) - 1. Find the complete exact solution of sin x...

Calc 2 - Ok, I have two questions first: 1. I'm asked to find a cartesian ...

trigonometry - Find all the angles between 0 degrees and 360 degrees which will ...

trigonometry - Find the exact value of each expression(no calculator): 1) sin^2(...

Algebra - Find a counterexample to the statement 4^n + 1 is divisible by 5...how...

Trigonometry - Find all the angles between 0° and 90° which satisfy the equation...