Sin^2 44-cos^2 44/2sin2

Question

Sin^2 44-cos^2 44/2sin2

Answer 1

5 sin^2 x - 3 sin x cos x - 2 cos^2 x = 0.
делим на cos²x
5tg²x-3tgx-2=0
Пусть tgx=t
5t²-3t-2=0
t1=(3+7)/10=1
t2=-0.4
a) tgx=1
x1=π4+πn
б) tgx=-0.4
x2=-arctg0.4+πn