1)
cosx/2=cos^2(x/2)
cosx/2(cosx/2-1)=0
x=П(2k+1)
cosx/2=1
x=4Пk
2)
tgx-tg(pi/2-x)-1=0
tgx-1/tgx-1=0
tgx=t
t^2-t-1=0
t1=(1+-sqrt(5))/2
tgx=[1-sqrt(5)]/2
x=arctg([1-sqrt(5)]/2)
x=arctg([1+sqrt(5)]/2)
4)
5)sqrt(3)sinx=cosx
tgx=1/sqrt(3)=sqrt(3)/3
x=П/6+Пk
сторона b+1
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