Question

3tgx*ctgx-2cos (π/2+x), если x=0,25

Answer 1

$3tgx*Ctgx-2Cos(frac{pi }{2}+x)=3*1+2Sinx=4+2Sinx\\4+2Sin0,25pi=4+2Sinfrac{pi }{4}=4+2*frac{sqrt{2} }{2}=4+sqrt{2}$