Question

7cos(π + B) -2sin(π/2+B) если cos B=-1/3

Answer 1

7cos(π + B) -2sin(π/2+B)=-7cosB-2cosB=-9cosB=-9*(-1/3)=3

Answer 2

7cos(π+b)-2sin(π/2+b)=7(-cosb)-2cosb=

-9cosb=-9*(-1/3)=3