SOLUTION: Can you please help me with this question? it says "What are the following trigonometric identities for the following:"
1.) (double angle) cos2x=
2.) cos(a+b)=
3.) (double angle
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-> SOLUTION: Can you please help me with this question? it says "What are the following trigonometric identities for the following:"
1.) (double angle) cos2x=
2.) cos(a+b)=
3.) (double angle
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Question 46853: Can you please help me with this question? it says "What are the following trigonometric identities for the following:"
1.) (double angle) cos2x=
2.) cos(a+b)=
3.) (double angle) sin2x=
4.) sin(a+b)=
...any help u can offer will be apreciated thank you for you time... Answer by Nate(3500) (Show Source):
You can put this solution on YOUR website! 1.) (double angle)
cos(2x) = cos^2(x) - sin^2(x) = 1 - 2sin^2(x) = 2cos^2(x) - 1
2.) cos(a + b) = cos(a)sin(b) - sin(a)cos(b)
3.) (double angle)
sin(2x) = 2sin(x)cos(x)
4.) sin(a + b) = sin(a)sin(b) + cos(a)cos(b)
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