Помогите пожалуйста!!!
1) cos(a)+[sin(a)*tg(a)]-[1/cos+a)]=0;

2) tg²(a)*[1+tg²(a)]*[1+ctg²(a)]-[1-tg²(a)]²=4tg²(a);

3) [tg(a)]/[tg(a)+ctg(a)]=sin²(a)

Заранее спасибо
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