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3+3*3=

$${\mathtt{3}}{\mathtt{\,\small\textbf+\,}}{\mathtt{3}}{\mathtt{\,\times\,}}{\mathtt{3}} = {\mathtt{12}}$$

$${\mathtt{78.35}}{\mathtt{\,\times\,}}{\mathtt{10}}\% = {\mathtt{7.835}}$$

Punkt vor Strich. Also zuerst 3*3=9, dann 9+3 = 12

enter your number 1.145 into the calculator input field and press "enter" or the "=" button

cos(A) = 0.97125

apply "acos" the arc-cosine, same as cos^-1, on both sides:

acos(cos(A)) = acos(0.97125)
A =acos( 0.97125 )

$$\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{cos}}^{\!\!\mathtt{-1}}{\left({\mathtt{0.971\: \!25}}\right)} = {\mathtt{13.772\: \!176\: \!508\: \!038^{\circ}}}$$

$${\frac{{\mathtt{142.8}}{mm}}{{\mathtt{2}}}} = {\mathtt{71.4}}{mm}$$