Question

1)sin(a-b)+2cosasinb,если sin(a+b)=0,17
2)cos(a+b)+2sinasinb,если cos(a-b)=0,64
3)(sin(a+b)-2cosasinb/2sinasinb+cos(a+b)*√3,если a-b=150градусов

Answer 1

1. 
$sin(a-b)+2cos asin b=sin acos b-cos asin b+2cos asin b=\ =sin acos b+cos asin b=sin(a+b)=0,17;$
2.
$cos(a+b)+2sin asin b=cos acos b-sin asin b+2sin asin b=\ =cos acos b+sin asin b=cos(a-b)=0,64;$
3.
$(sin(a+b)-frac{2cos asin b}{2sin a sin b}+cos(a+b)cdotsqrt{3}=\ =sin acos b+sin bsin a$