Better Students Ask More Questions.
What is the right choice for question 25) ? http://postimg.org/image/jmc3afzb9/
1 Answer | add yours
We know that;
So the correct choice is b).
Actually `(1-2sin^2x) ` means `cos2x` .
`Cos2x` can be written in the following forms.
`cos2x = 1-2sin^2x = 2cos^2-1 = cos^2x-sin^2x`
Posted by jeew-m on August 17, 2013 at 1:07 AM (Answer #1)
Join to answer this question
Join a community of thousands of dedicated teachers and students.