Louise Johnson
Junior Member
- Joined
- Jan 21, 2007
- Messages
- 103
Hello could anyone give these a quick check? I realize these answers can be proven by plugging them in for x and verifying both sides are equal. However I have an incredible ability to miss stuff or just screw things up.
Thank you
Louise
Solve each equation for x where x is equal or greater than zero and less than 2pi
#1
Sinx=sqrt3cosx
Answer x=Pi/3 and 4pi/3
#2
Sin(x-pi/2)=cos^2x
Answer x= pi/2 and 3pi/2
#3 Prove the identity Find the exact value of cos 75degrees
Answer cos75degrees =cos(45+30)=cos45+30-sin45sin30
=sqrt6-sqrt2 over 4
Thank you
Louise
Solve each equation for x where x is equal or greater than zero and less than 2pi
#1
Sinx=sqrt3cosx
Answer x=Pi/3 and 4pi/3
#2
Sin(x-pi/2)=cos^2x
Answer x= pi/2 and 3pi/2
#3 Prove the identity Find the exact value of cos 75degrees
Answer cos75degrees =cos(45+30)=cos45+30-sin45sin30
=sqrt6-sqrt2 over 4