I am stuck and need help...

Subject:

Comments:
: Hi I sure need some help in finishing these... : Question 9.b). : Given that sin 55deg = .819 and cos 20deg = .94 : Show how you would use the identities for sin (A+B) nd cos (A+B) to find the followingcos 35 : = cos (55 - 20) : = (cos 55) (cos 20) + (sin 55) (sin20) : : Question 9.c). : Given that sin 55deg = .819 and cos 20deg = .94 : Show how you would use the identities for sin (A+B) nd cos (A+B) to find the followingcos 35 : = tan (A-B) : = tan A- tan B : ------------- : 1+tan A tan B : : Question 10. b). : Prove that : sin x cos x 1 : ------------- + ------------- = ------- : sin x + cos x sin x - cos x sin^2 x-1 : : (please note that when I put ^2, I am trying to say that there is a small 2 above the sin. Kind of like the squared symbol). : Any help will be greatly appreciated... : Thanks, : SERG... :

Optional Link URL:
Link Title:
Optional Image URL: