Kaitlyn's bloggg

In this blogg, i am going to go over 10-1. This section was probably one of the easiest ones we have done so far this year because all you have to do is know the formulas and you will know how to solve the problems. you also have to make sure you know the trig chart.

Formulas: sin(A+-B)=sinAcosB+-cosAsinB
cos(A+-B)=cosAcosB-+sinAsinB

Ex: find the exact value of sin75
-sin(45+30)=sin45cos30+cos45sin30
-sin(75)=(squarerootof 2/2)(squarerootof 3/2)+(squarerootof 2/2)(1/2)
-sin(75)=(squarerootof6/4)+(squarerootof2/4)
-sin(75)=(squarerootof 6+squarerootof 2)/4 <----answerrrrrrrr!

ex: simplifyyy cos40cos20-sin40sin20
-cos(40+20)
-cos(60)
-1/2 <----answerrr!!