Question

C^2 = a^2 + b^2 - 2ab cos C make cos C the subject of the formula

Answer 1

Answer:

$\frac{c^{2}-a^{2}-b^{2} }{-2ab}$=cos C

Step-by-step explanation:

Start with the parts that are more loosely attached to the cos C: the a² and the b², they are only attached with addition, which can be easily undone by subtracting from both sides. That gives you c²-a²-b²=-2abC

Next, since you want to isolate cosC, you will want to divide by everything attached to the cosC by multiplication: (c²-a²-b²)÷(-2ab)=cosC. Then you can neaten it up and put it in fraction form: $\frac{c^{2}-a^{2}-b^{2} }{-2ab}$=cos C