Question

Oblicz:

a)sin3/4π

b)cos2/3π

c)tg7/6π

d)sin(-20/3π)

e)cos11π

f)tg(-7/3π)

g)sin 19/2π

h)cos(-11/4π)

Answer 1

a) sin3/4π=sin(3/4*180)=sin(135)=sin(45)=√2/2

b)cos2/3π=cos(2/3*180)=cos(120)=-cos(30)=-√3/2

c)tg7/6π=tg(7/6*180)=tg(210)=tg(30)=√3/3

d)sin(-20/3π)=sin(-1200)=sin(-60)=-sin(60)=-√3/2

e)cos(11π)=cos(π)=-cos(0)=-1

f)tg(-7/3π)=tg(420)=tg(60)=√3

g)sin(19/2π)=sin(1710)=-sin(90)-1

h)cos(-11/4π)=cos(-495)=-cos(45)=-√2/2