Question

ПОМОГИТЕ РЕШИТЬ ( НА ФОТО)

Answer 1

= 1+ (-3/4)²=frac{1}{ cos beta ^{2} 
   frac{25}{16}= frac{1}{ cos^{2 } beta } ; cos beta = sqrt{ frac{9}{25} } = -frac{3}{5} ;  sinβ = √41/5;  ctgβ = 3/4;

б) 1+ctg²β =1/sin²β;   1+ 25/144 = 1/sin²β;  sinβ= √169/144 = 13/12;