Question

Determine o valor das seguintes expressões:
a) y= cossec 4pi/3 + sec 7pi/6
b) y= 4.cossec 5pi/6 - raiz3.sec 7pi/6
c) y= 2.cos 5pi/3 + sen 5pi/6 +4.sen 3pi/2



URGENTEEE, PLEASE...

Answer 1

Oi Mavih

a) 

sen(4pi/3) = -√3/2 
cossec(4pi/3) = -2√3/3

cos(7pi/6) = -√3/2
sec(7pi/6) = -2√3/3

y = -2√3/3 - 2√3/3 = -4√3/3 

b)

sen(5pi/6) = 1/2
cossec(5pi/6) = 2

y = 4*3 - √3*(-2√3/3) = 12 + 2 = 14

c) 

cos(5pi/3) = 1/2
sen(5pi/6) = 1/2
sen(3pi/2) = -1 

y = 2*1/2 + 1/2 - 4 = 3/2 - 8/2 = -5/2

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