Can someone please show me, step-by-step, how(adsbygoogle = window.adsbygoogle || []).push({});

cos(θ)sin(θ+φ)-sinθcos(θ+φ)

simplifies to sinφ?

I know I have to use trig identities, and I got to cos^{2}θsinφ-sin^{2}θcosφ but I'm not sure where to go from there.

Thanks

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# Simplify this expression?

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