1.

Provet that Cos4A +Sin4A + 2Sin2A Cos2 A= 1​

Answer»

Step-by-step EXPLANATION:

cosA+sinA+2sin²Acos²A

=(cos²A)²+(sin²A)²+2sin²Acos²A

=(sin²A+cos²A)²

=1²

=1



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