Could someone show me the first couple of steps of this Proof. 2/1+cosx - tan^2(x/2) = 2cosx/1+cosx. Im working with the left side. I know to use Half-Angle I.D. I've tried all 3 tan Half angles. just keep getting hung up.
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Originally Posted by Brndo4u Could someone show me the first couple of steps of this Proof. 2/1+cosx - tan^2(x/2) = 2cosx/1+cosx. Im working with the left side. I know to use Half-Angle I.D. I've tried all 3 tan Half angles. just keep getting hung up. $\displaystyle \displaystyle \frac{2}{1+\cos{x}} - \tan^2\left(\frac{x}{2}\right) = \frac{2\cos{x}}{1+\cos{x}}$ is not an identity. let $\displaystyle \displaystyle x = \frac{\pi}{2}$ and see what happens. fyi , the left side = 1 for all defined values of x.
I understand that it is not an equation. I need to verify that one side equals the other.
Originally Posted by Brndo4u I understand that it is not an equation. I need to verify that one side equals the other. but one side does not equal the other ... are you trying to solve the equation for a specific value of x ?
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