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radh
 2 years ago
Best ResponseYou've already chosen the best response.01. 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

waterineyes
 2 years ago
Best ResponseYou've already chosen the best response.5In first case, you are to find cosx and cosy..

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

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

radh
 2 years ago
Best ResponseYou've already chosen the best response.0Thanks for the method. I wasn't sure what I was supposed to use here.

waterineyes
 2 years ago
Best ResponseYou've already chosen the best response.5Must 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..
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