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Use a double-angle formula to find the exact value of the given expression.\\ $2\cos^2 15^\circ - 1$ 

          Use a double-angle formula to find the exact value of the given expression.\\
$2\cos^2 15^\circ - 1$
Use a double-angle formula to find the exact value of the given expression. 2cos^2 15^∘ - 1

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Precalculus with Limits
Precalculus with Limits
Ron Larson 2nd Edition
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Use a double-angle formula to find the exact value of the given expression. 2cos^(2)15deg -1 Use a double-angle formula to find the exact value of the given expression 2cos215-1
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Transcript

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00:01 Just looking at this function, i see that i have tangent of an angle plus tangent of another angle all over one minus tangent of the same angles.
00:06 So when i have the same angles, either added or subtraction, then multiplied, this kind of looks like a tangent addition or subtraction formula with these angles.
00:16 Okay.
00:16 Would this be addition or subtraction? well, it's the same operation as the numerator for tangent.
00:22 So it's going to be addition...
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