sen(x) = cos(90-x) ou cos(x) = sen(90-x)
tg (x) = cotg(90-x) ou cogt(x) = tg(90-x)
y = sen50°/cos40° + 2.tg25°/cot65°+ cos20°/2.sen70°
y = sen50º/sen50° + 2tg25º/tg 25º + cos20°/2cos20º
y = 1+2 + 1/2
y = 3+1/2
y = 5/2
y=2,5
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sen(x) = cos(90-x) ou cos(x) = sen(90-x)
tg (x) = cotg(90-x) ou cogt(x) = tg(90-x)
y = sen50°/cos40° + 2.tg25°/cot65°+ cos20°/2.sen70°
y = sen50º/sen50° + 2tg25º/tg 25º + cos20°/2cos20º
y = 1+2 + 1/2
y = 3+1/2
y = 5/2
y=2,5