# Math Help - find values of sine, cosine etc of angle

1. ## 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

2. 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 $x= \pi/4$