Evaluate:
$sin 7 0^{o} sin 2 0^{o} - cos 2 0^{o} cos 7 0^{o}$

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Evaluate:

sin 7 0^{o} sin 2 0^{o} - cos 2 0^{o} cos 7 0^{o}

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Text solutionVerified

sin 7 0^{o} sin 2 0^{o} - cos 2 0^{o} cos 7 0^{o}

sin (9 0^{o} - 2 0^{o}) sin 2 0^{o} - cos 2 0^{o} cos (9 0^{o} - 2 0^{o})

= cos 2 0^{o} sin 2 0^{o} - cos 2 0^{o} sin 2 0^{o}

= 0

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