Find 
by using the Chain Rule. Express your final answer in terms of t.w = ex cos y + ey cos x; x = 5t, y = -4t
A. e5t(5 cos -4t - 4 sin -4t) e-4t(-4 cos 5t + 5 sin 5t)
B. e5t(5 cos -4t + 4 sin -4t) e-4t(-4 cos 5t - 5 sin 5t)
C. e-4t(5 cos -4t - 4 sin -4t) e5t(-4 cos 5t + 5 sin 5t)
D. e-4t(5 cos -4t + 4 sin -4t) e5t(-4 cos 5t - 5 sin 5t)
Answer: B
Mathematics
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