# Calculate angle

• Dec 16th 2009, 08:55 AM
Apprentice123
Calculate angle
$sin(\theta ) cos( \theta) = 0,7$

What is the value of $\theta$ ?
• Dec 16th 2009, 09:32 AM
e^(i*pi)
Quote:

Originally Posted by Apprentice123
$sin(\theta ) cos( \theta) = 0,7$

What is the value of $\theta$ ?

Use the identity $sin \theta cos \theta = \frac{1}{2}sin(2\theta)$
• Dec 16th 2009, 10:47 AM
bigwave
the solutions to this are imaginary

$sin^{-1}\left(1.4\right)$ is non real