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radhBest ResponseYou've already chosen the best response.0
1. cos (x + y) if sin x = 5/13 and sin y = 4/5 2. sin (x – y) if cos x = 8/17 and cos y = 3/5 3. tan (x – y) if csc x = 13/5 and cot y = 4/3
 one year ago

waterineyesBest ResponseYou've already chosen the best response.5
In first case, you are to find cosx and cosy..
 one year ago

waterineyesBest ResponseYou've already chosen the best response.5
Using the identity : \[\cos^2(x) + \sin^2(x) = 1\]
 one year ago

waterineyesBest ResponseYou've already chosen the best response.5
Then after finding you are supposed to use : \[\cos(x+y) = \cos(x) \cos(y)  \sin(x) \sin(y)\]
 one year ago

radhBest ResponseYou've already chosen the best response.0
Thanks for the method. I wasn't sure what I was supposed to use here.
 one year ago

waterineyesBest ResponseYou've already chosen the best response.5
Must remember for the intervals you are given with.. x and y are in 0 to 90 interval, and all trigonometric ratios in this range will be positive..
 one year ago
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