1.

Pag: o) o cas? L0

Answer»

= cos^2(45 + theta) + cos^2(45 - theta)

= cos^2(45 + theta) + sin^2{90 - (45 -theta)}

= cos^2(45 + theta) + sin^2(90 - 45 + theta)

= cos^2(45 + theta) + sin^2(45 + theta)

= 1

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