Question

Изи баллы!!!!!, Помогите!!!!!!

Answer 1

3. sinx(1-(sinx)^2)/(cosx)^2+2sinx=3sinx
4. (25sin^2 f-9-16+25cos^2 f)/(4-5cosf)(3+5sinf)=25-9-16/(4-5cosf)(3+5sinf)=0