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experimentXBest ResponseYou've already chosen the best response.0
 4 sin x sin y + 4 cos x cos y dy/dx = 0 => dy/dx = sin x sin y/ cos x cos y = tan x tan y
 2 years ago

lalalyBest ResponseYou've already chosen the best response.3
use the product rule,, \[4sinxsiny+4cosxcosy \frac{dy}{dx}=0\]\[\frac{dy}{dx}=\frac{4sinxsiny}{4cosxcosy}=tanxtany\]
 2 years ago

.Sam.Best ResponseYou've already chosen the best response.1
4cosxsiny=1 differentiate, 4[(cosx)(cosy)(y')+(siny)(sinx)]=0 4(cosx)(cosy)(y')=4sinxsiny (y')=4sinxsiny /4(cosx)(cosy)
 2 years ago
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