5 Answered Questions for the topic Double Angle Identities

Double Angle Identities Math Precalculus

03/09/22

Find cos 2theta
If cos theta = 24/25 and 3pi/2 < theta < 2pi, then what is cos 2 theta? I think I figured it out using double agent, but I just want to check my answer, and it's kind of hard to look up.
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Double Angle Identities Trigonometry

04/03/21

Given COS theta = 4/5 and SIN theta < 0 , find Sin(2 theta) , Cos(2 theta) , and Tan(2 theta)

the sin theta <0 part throws me off and I don't understand how to go about the problem with that in it
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Double Angle Identities Precalculus

03/05/21

given some information about theta, find sin2 theta, cos2 theta, and tan2 theta. A.) cos theta=-1/4 and pi/2 is less than theta less than pi.

B.) sec theta = 5/2 and sin theta is greater than 0. C.) sin theta=3/5 and tan theta is less than 0
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Double Angle Identities Math Trigonometry

03/11/19

Given that sin(2x) = 24/25, and 45 degrees < x < 90 degrees, find cos(2x)
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Double Angle Identities Algebra 2

05/04/14

How do you find solutions of 4cos^2x=1?
Zero is less than or equal to x and x is less than 360   I tried using different double angle identities but I can't figure out which to use and how to use it. 
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