Question

(cos⁴A - sin⁴A) is equal to​

Answer 1

Answer:

....................

Answer 2

${ \cos }^{4} \alpha - { \sin }^{4} \alpha \\ \\ = > { ({ \cos }^{2} \alpha )}^{2} - {( { \sin}^{2} \alpha ) }^{2} \\ \\ = > ( { \cos}^{2} \alpha + { \sin }^{2} \alpha )( { \cos }^{2} \alpha - { \sin}^{2} \alpha ) \\ \\ = > 1 \times \cos2 \alpha \\ \\ = > \cos2 \alpha$

✌️_____ Fóllòw MË _____✌️