This week we reviewed trig. I decided that I would blog about chapter ten formulas because there are so many and we all need to remember those babies. Here we go with the reviewing and the math and what not.

1. cos(alpha+/-beta)=cosalphacosbeta-/+sinalphasinbeta
2. sin (alpha+/-beta)=sinalphacosbeta+/-cosalphasinbeta
3. sinx+siny=2sinx+y/2 cosx-y/2
4. sinx-siny=2cosx+y/c sin x-y/2
5. cosx+cosy=2cosx+y/2cosx-y/2
6.cosx-cosy=-2sinx+y/2 sinx-y/2

EXAMPLE do you remeber how to d these?you bette :D
Find the exact value of sin75degrees.
sin(45degrees+30degrees)=sin45cos30-cos45sin30
45degrees is alpha and 20 degrees is beta. I simply plugged it in to equation 2 silly

THAT IS ALL I HAVE TO SAY ON THE SUBJECT.

--Sarah 😁