If sin α + cos α = p, then what is cos2 (2α) equal to? – McqOptions

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1.	If sin α + cos α = p, then what is cos2 (2α) equal to?
A.	p2
B.	p2 - 1
C.	p2(2- p2)
D.	p2 + 1
Answer» D. p2 + 1

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