May 2021 1 90 Report
O valor de y = (cos a + cos b)² + (sen a - sen b)², para a+b = π/2 é?

O valor de y = (cos a + cos b)² + (sen a - sen b)², para a+b = π/2 é:

a)1/2

b)2

c)0

d)1

e)4

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