21 Donner la valeur exacte des nombres suivants. a) cos(2014pi) b) sin(125pi/2) c) cos(55pi/3) d) sin(-95pi/4) Bonjour j’ai besoin d’aide sur cette exercice que

Bjr

A = cos(2014pi)

A = cos(0+2×1007pi)

A = cos(0)

A = 1

B = sin(125pi/2)

B = sin(pi/2+2×31pi)

B = sin(pi/2)

B = 1

C = cos(55pi/3)

C = cos(pi/3+2×9pi)

C = cos(pi/3)

C = 0,5

D = sin(-95pi/4)

D = -sin(95pi/4)

D = -sin(7pi/4+2×11pi)

D = -sin(7pi/4)

D = -(-√2/2)

D = 0,70

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