b/a-b*1/a+b*1/b =b/a-b/a+b/b= 0 +1=1
1) √3ctg(3π/2 - x) = - √3
tgx = - 1
x = - π/4 + πk, k∈Z
2) 1 - 2*sin^2(π/2 - x) = 0
cos^2x = 1/2
a) cosx = - √2/2
x = (+ -)arccos(- √2/2) + 2πn, n∈Z
x = (+ -)*(π - arccos(√2/2) + 2πn, n∈Z
x = (+ -)*(π - π/4) + 2πn, n∈Z
x1 = (+ -)*( 3π/4) + 2πn, n∈Z
b) cos^2x = √2/2
x = (+ -)arccos(√2/2) + 2πn, n∈Z
x2 = (+ -)*( π/4) + 2πn, n∈Z
3) ctg(3π/2 + x)*ctg(x - π/2) = 1
tgx*tgx = 1
tg^2x = 1
a) tgx = - 1
x = - π/4 + πk, k∈Z
b) tgx = 1
x = π/4 + πn, n∈Z
37х-689/х^2-37х+340=37х-689/(х-20)×(х-17)
/ - это дробь
<span>1) 2х - 5у;
2) (a + 0,6с)</span>²<span>;
3) x</span>³ + <span>y</span>²<span>;
4) (m - n)</span>²<span>;
5) m</span>² - <span>n</span>²<span>.</span>
2cos^2x-sinx+1=0
1+cos2x-sinx+1=0
2sin^2x+sinx-3=0
sinx=a
2a^2+a-3=0
D=1+24=25
t1/2=-1+-5/4=1:-1.5(пост.)
sinx=1
x=pi/2+2pik