Find y' if y = cos(x + y). (5 points) 1. 0 2. 1 3. -sin(x + y) 4. the quotient of negative 1 times the sine of the quantity x plus y and 1 plus the sine of the quantity x plus y

4 )

Step-by-step explanation:

Given  y = cos (x +y) ...(i)

we will use formula

Differentiating equation (i) with respective to 'x'

on simplification , we get

Taking common  

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step-by-step explanation:

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)