1.

cos ^(2) ((pi)/(4)beta)- sin ^(2) (alpha - (pi)/(4))=

Answer»

`SIN (ALPHA + BETA) sin (alpha - beta)`
`COS (alpha + beta) cos (alpha - beta)`
`sin (alpha + beta) cos (alpha + beta)`
`sin (alpha + beta) cos (alpha - beta)`

ANSWER :D


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