Question

I need help with this identity:

Answer 1

Replace 105 with 60+45

Answer 2

is the question asking for 3 equations and 3 answers or just 1?

Answer 3

1 answer: the exact value of cosine 105

Answer 4

Remember that 60 degrees = pi/3 radians and 45 degrees = pi/4 radians

Answer 5

@surjithayer You're not going to post the answer are you?

Answer 6

\[1/2 x \sqrt{2}/2 - \sqrt{3}/2 x \sqrt{2}/2

Answer 7

what do i do now?

Answer 8

Do the multiplication.

Answer 9

cross multiply?

Answer 10

NOI!!! IT IS NOT A PROPORTION.