Verify the Identity (sin(x)+cos(x))^2=1+2sin(x)cos(x)

Problem

(sin(x)+cos(x))2=1+2*sin(x)*cos(x)

Solution

1. Expand the left side of the equation using the square of a binomial formula (a+b)2=a2+2*a*b+b2

(sin(x)+cos(x))2=sin2(x)+2*sin(x)*cos(x)+cos2(x)

2. Rearrange the terms to group the squared trigonometric functions together.

sin2(x)+cos2(x)+2*sin(x)*cos(x)

3. Apply the Pythagorean identity sin2(x)+cos2(x)=1 to simplify the expression.

1+2*sin(x)*cos(x)

4. Compare the simplified left side to the right side of the original identity to confirm they are equal.

1+2*sin(x)*cos(x)=1+2*sin(x)*cos(x)

Final Answer

(sin(x)+cos(x))2=1+2*sin(x)*cos(x)

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