Given data
<span>sin (x+pi/2)=cos x
</span>now using sin law
sin(a+b)=sin(a)cos(b)+cos(a)sin(b)
now using above values
sin(pi/2+x)=sin(pi/2)cos(x)+cos(pi/2)sin(x)
as we know that
sin(pi/2)=1
cos(pi/2)=0
now putting these values
sin(pi/2+x)=1*cosx+0*1
sin(pi/2+x)=cosx
hence proved that
<span>sin (x+pi/2)=cos x</span>
Step-by-step explanation:
▪ x - 3 < 3x - 7
▪ x + 4 < 3x
▪ 4 < 2x
▪ 2 < x
Answer:
3 feet
Step-by-step explanation:
half his height
Answer:
d = 4
Step-by-step explanation:
- 6 - d = 6 - 4d ( add 4d to both sides )
- 6 + 3d = 6 ( add 6 to both sides )
3d = 12 ( divide both sides by 3 )
d = 4
