# find values of sine, cosine etc of angle

• November 20th 2008, 07:49 AM
jvignacio
find values of sine, cosine etc of angle
without using calculator, find the values of sine, cosine, tangent, cotangent of the following angle:

$
\frac{3\pi}{4}
$

any help much appreciated
• March 17th 2009, 01:14 AM
Quote:

Originally Posted by jvignacio
without using calculator, find the values of sine, cosine, tangent, cotangent of the following angle:

$
\frac{3\pi}{4}
$

any help much appreciated

Always Remember this
$sin(\pi-x) = sin(x)$

$cos(\pi-x)= -cos(x)$

$tan(\pi-x)= -tan(x)$

$cot(x) = \frac{1}{tan(x)}$

Here $x= \pi/4$