2sin-cos=√3 then find sin+2cos
Answers
Answered by
1
s=sin
c=cos
2s-c=3**1/2 (eq1)
let s+2c=k (eq2)
square eq 1 (** represents ' to the power')
4s**2+c**2-2sc=3 eq3
square eq2
s**2+4c**2=k**2 eq4
add eq3 and eq4
5s**2+5c**2=k**2+3
5(s**2+c**2)=k**2+3
5-3=k**2 (s**2+c**2=1)
k=2**1/2
hope this helps
PSN03:
welcome
Similar questions