Question

find the value cos(-45°) step by step​

Answer 1

Answer:

If angle in cos is given negative, it has to be written as positive (IT'S THE RULE)

So our question is cos45°

The value for cos45°in trigonometry is - 1/root2.

So your answer is 1/root2.

Step-by-step explanation:

All possible explanation is given

Answer 2

Step-by-step explanation:

cos(-45) = cos(-pi/4) = cos(pi + pi/4) = cos(5*pi/4) = cos 135

another way is cos(-45) = cos(45) =

$\frac{1}{ \sqrt{2} }$

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