Question

What is the answer to this problem?

Answer 1

(-√6+√2)/4

Explanation:

we'll use the addition identity of cos which is cos(a+b)=cos(a)*cos(b)+sin(a)*sin(b)

and the numbers we'll use are 180 and 75 since they add up to make 255 and they have some fixed values so we'll add them up

cos(75+180)= cos(75)*cos(180)+sin(75)*sin(180)

and the answer we get is (
`-√(6) +√(2)`)/4

basically, just write this in fraction form without the brackets (the 4 is dividing both of them so write it in the middle)

I hope I get this write as this is the first time I'm solving questions like these

and one thing to remember is that for cosine try to use numbers under 180 or 180 itself as the range of the cosine function is from -180 to 180 so even if we use like 181 it goes into negative and decimal similarly for sine its -90 to 90