Question

1) ([email protected])ctg^@([email protected]) 2) ([email protected]*[email protected]*cosB) *[email protected]+1

Answer 1

1) (1-cos^2 @)* ctg^2 @=(1-cos^2 @)*cos^2 @/sin^2 @=sin^2 @*cos^2 @/sin^2 @=cos^2 @

2) ([email protected]*sinB/[email protected]*cosB)*(cosB*[email protected]+sinB*[email protected]/[email protected]*sinB)=(cosB*[email protected]+sinB*[email protected])/[email protected]*cosB=tg @+ tg B

и в следующий раз пиши нормально)