cos²(π/4)+sin(5π/6)-tg(π/4)=(√2/2)²+1/2-1=1/2+1/2-1=1-1=0.
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cos²(π/4)+sin(5π/6)-tg(π/4)=(√2/2)²+1/2-1=1/2+1/2-1=1-1=0.