britbrat4290
Complete the identity...



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britbrat4290
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Psymon
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\[\cos(ab) = \cos(a)\cos(b) + \sin(a)\sin(b)\]
That's a start.

britbrat4290
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ty @Psymon

britbrat4290
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@Coolsector can u confirm im right? 1 + tan α tan β

britbrat4290
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or @Psymon

Psymon
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That's what it looks like to me.

Coolsector
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yes