Answer :

To solve the given equation, let's start by rewriting and simplifying the expression:

[tex]\[ \sin \theta \cos ^3 \theta + \sin ^3 \theta \cos \theta = \sin \theta \cos \theta \][/tex]

First, notice that [tex]\(\sin \theta \cos \theta\)[/tex] appears on both sides of the equation. We can subtract [tex]\(\sin \theta \cos \theta\)[/tex] from both sides to simplify:

[tex]\[ \sin \theta \cos ^3 \theta + \sin ^3 \theta \cos \theta - \sin \theta \cos \theta = 0 \][/tex]

Now, factor out the common term [tex]\(\sin \theta \cos \theta\)[/tex] from the left-hand side:

[tex]\[ \sin \theta \cos \theta (\cos ^2 \theta + \sin ^2 \theta - 1) = 0 \][/tex]

Recall the Pythagorean identity which states:

[tex]\[ \sin^2 \theta + \cos^2 \theta = 1 \][/tex]

Substitute [tex]\(1\)[/tex] for [tex]\(\sin^2 \theta + \cos^2 \theta\)[/tex] in the equation:

[tex]\[ \sin \theta \cos \theta (1 - 1) = 0 \][/tex]

This simplifies to:

[tex]\[ \sin \theta \cos \theta \cdot 0 = 0 \][/tex]

Thus, no matter what values [tex]\(\theta\)[/tex] takes, the left-hand side will always be zero:

[tex]\[ 0 = 0 \][/tex]

Therefore, the simplified form of the original equation is indeed:

[tex]\[ 0 \][/tex]

This completes the verification and confirmation that the original expression simplifies to zero.

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