Question: Consider the following. cos(a + b)/cos(a) cos(b) = 1 - tan(a) tan(b) Prove the identity. cos(a + b)/cos(a) cos(b) = cos(a) cos(b)/cos(a) cos(b) - cos(a)

Consider the following. cos(a + b)/cos(a) cos(b) = 1 - tan(a) tan(b) Prove the identity. cos(a + b)/cos(a) cos(b) = cos(a) cos(b)/cos(a) cos(b) - cos(a) cos(b)/cos(a) cos(b) - = 1 - (sin(a)/sin(b))

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