Hello, i need help with trigonometric identities, if anyone can help me, please add me to your msn messenger, my e-mail is falcolneye@hotmail.com, i need someone to help me!!!
THANKYOU!
Hello, i need help with trigonometric identities, if anyone can help me, please add me to your msn messenger, my e-mail is falcolneye@hotmail.com, i need someone to help me!!!
THANKYOU!
$\displaystylecos琊cos球+sin琊sin球+sin琊+cos球+sin球cos琊=1
cos^2x(cos^2y+sin^2y)+sin^2xsin^2y+sin^2x+cos^2y = 1$
$\displaystyle
cos^2x+sin^2x+sin^2xsin^2y+cos^2y = 1$
$\displaystyle sin^2xsin^2y+cos^2y = 0$
$\displaystyle
(sinxsiny)^2 = -cos^2y$
Since $\displaystyle (sinxsiny)^2 \geq 0$ and $\displaystyle -cos^2y \leq 0$
$\displaystyle
(sinxsiny)^2 = -cos^2y = 0$
$\displaystyle
y = \frac{\pi}{2} +n\pi$
$\displaystyle
x = m\pi$
where n,m are integers.