Question

Помогите пожалуйста решить
Даю 55 баллов​

Answer 1

$1)$

$ctgt-\frac{cost-1}{sint}=\frac{cost}{sint}-\frac{cost-1}{sint}=\frac{cost-cost+1}{sint}=$$\frac{1}{sint}$

$2)$

$1+sint=\frac{cost+ctgt}{ctgt}$

$1+sint=\frac{cost}{ctgt}+\frac{ctgt}{ctgt}$

$1+sint=\frac{cost}{ctgt}+1$

$1+sint=1+\frac{cost}{ctgt}$

$1+sint=1+cost:\frac{cost}{sint}$

$1+sint=1+\frac{cost*sint}{cost}$

$1+sint=1+sint$