Question

evaluate cos 1485 degree

Answer 1

For angles larger than 360°, its trigonometric ratios will be equivalent to the angles reduced by 360° or its multiple.

Since 1485° = 4*360°+45°, 
cos 1485°= cos(4*360°+45°) 
cos 1485°= cos 45° = $\frac{1}{ \sqrt{2} }$

Answer 2

Answer:

cos 1485 = $\frac{1}{\sqrt{2} }$

Step-by-step explanation:

We know that there are 4 quadrents . In the first quardent all Sin , Cos , Tan are positive. In second quardent Sin is positive . In third quardent Tan is positive . In fourth quardent Cos is positive . Here the angle is 1485 degree

. It means it will equal to $4 * 360 degree + 45 degree$. So it is first quadrent.

$Cos 1485\\\\= Cos (4*360+45)\\\\= Cos 45\\\\= \frac{1}{\sqrt{2} }$

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