Question #327270

a. Solve the differential equation 𝑠i𝑛(𝑥 + 𝑦) + 𝑐𝑜𝑠(𝑥 + 𝑦) − 𝑑𝑦/𝑑𝑥 = 0.


b. Solve the differential equation (𝐷2 + 4𝐷 + 13)𝑦 = cos 3𝑥.


c. Eliminate arbitrary constants from 𝑧 − (𝑥 − 𝑎)2 = (𝑦 − 𝑏)2 to form the partial differential equation



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