If anyone could help me with these it would be greatly appreciated, I really have no idea how to start. If sinx/siny = 1/2, and cosx/cosy = 3 prove sin(x+y) = 7/3sinxcosx and If cosx + sinx = 2/3, find the value of sin 2x
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Originally Posted by ringo If anyone could help me with these it would be greatly appreciated, I really have no idea how to start. If sinx/siny = 1/2, and cosx/cosy = 3 prove sin(x+y) = 7/3sinxcosx and If cosx + sinx = 2/3, find the value of sin 2x Sub in the values you have for the above
Originally Posted by ringo If anyone could help me with these it would be greatly appreciated, I really have no idea how to start. If sinx/siny = 1/2, and cosx/cosy = 3 prove sin(x+y) = 7/3sinxcosx and If cosx + sinx = 2/3, find the value of sin 2x HI for the second part , cos x + sin x =2/3 square both sides , cos ^2 x + sin^2 x +2sin x cos x = 4/9 2 sin x cos x = 4/9 -1
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