Question

Помогите пожалуйста упростить!

Answer 1

$frac{ sin^{2}t }{1+cost}= frac{1- cos^{2}t }{1+cost}= frac{(1-cost)(1+cost)}{1+cos t}=1-cost$

$(1- sin^{2}t )(1+ tg^{2} t)= cos^{2}t(1- frac{ sin^{2}t }{cos^{2}t} )= \ =cos^{2}t-frac{ cos^{2}tsin^{2}t }{cos^{2}t} =cos^{2}t-sin^{2}t= \ =1-sin^{2}t-sin^{2}t=1-2sin^{2}t$

Answer 2

ิ้ะั่ารึ ร เะัำำง้ัย ผั_ุุุุุุ