Question

tg²x+ctg²x+2=(1/sinxcosx)

Answer 1

tg^2 x + 1 + ctg^2 x + 1= 1/cos^2 x + 1/sin^2 x= (sin^2 x + cos^2 x)/sin ^2 x * cos ^2 x = (1/cos x * sin x) ^2, asa ar trebui sa fie corect.