y=4sen900°-2cos630°+1/cos720°
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y = 4sin900 - 2cos630 + 1/cos720
= 4sin(5*180 + 0) - 2cos(3*180 + 90) + 1/cos(4*180 + 0)
= -4sin0 + 2cos90 - 1/cos0
= 0 + 0 - 1
y = -1
= 4sin(5*180 + 0) - 2cos(3*180 + 90) + 1/cos(4*180 + 0)
= -4sin0 + 2cos90 - 1/cos0
= 0 + 0 - 1
y = -1
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