2 2 .
find d d 3 3 𝑦 𝑥 , given that 6 𝑥 + 6 𝑦 = 2 5 2 2 .
if 𝑥 + 𝑥 𝑦 + 𝑦 = 1 2 3 , find the value of 𝑦 ′ ′ ′ at 𝑥 = 1 .
suppose that 𝑒 − 2 𝑥 𝑦 = 𝑒 2 𝑦 3 . find 𝑦 ′ ′ when 𝑥 = 0 .
given that 𝑒 𝑦 + 3 𝑒 𝑥 = 5 𝑥 5 𝑦 5 , determine d d 𝑦 𝑥 at 𝑥 = 0 .
given that 9 𝑥 𝑒 + 𝑦 𝑒 = 7 − − 5 𝑦 7 8 𝑥 5 , 