Question

cos²Π/4+sin5Π/6-tgΠ/4

Answer 1

$cos^2(frac{pi}{4})+sinfrac{5pi}{6} -tgfrac{pi}{4}=(frac{sqrt{2} }{2})^2+frac{1}{2} -1=frac{1}{2}+ frac{1}{2}-1=1-1=0$

Answer 2

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