1) sin^2a+cos^2a+ctg^²b
2) cosa*cos√(a)+sina*sin√(a)
3) sin(π/4+b), если sinb=0,8 ; π/2 < b < π
2) cosa*cos√(a)+sina*sin√(a)
3) sin(π/4+b), если sinb=0,8 ; π/2 < b < π
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