Which of the following options are equal to cos 2 A -sin 2 A -A- 1-2 sin 2 AB- cos 2 AC- -sin 2 AD- 2 cos 2 A -1

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Trigonometric Identities

Which of the ...

Question

Which of the following options are equal to $c o s^{2} A - s i n^{2} A$ ?

$1 - 2 s i n^{2} A$

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$c o s^{2} A$

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$- s i n^{2} A$

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$2 c o s^{2} A - 1$

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Which of the following options are equal to ${cos}^{2} A - {sin}^{2} A$ ?

{sin}^{4} A - {cos}^{4} A = {sin}^{2} A - {cos}^{2} A = 2 {sin}^{2} A - 1 = 1 - 2 {cos}^{2} A

\frac{s i n A + c o s A}{s i n A - c o s A} + \frac{s i n A - c o s A}{s i n A + c o s A} = \frac{2}{s i n^{2} A - c o s^{2} A} = \frac{2}{2 s i n^{2} A - 1} = \frac{2}{1 - 2 c o s^{2} A}

\frac{1 + sin 2 A - cos 2 A}{1 + sin 2 A + cos 2 A} = tan A

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