Question: In Problems 4974, establish each identity. cos(a + 3) cos (a - B) 1 tanatan 3 1 + tanatan 3

In Problems 49–74, establish each identity.cos(a + 3) cos (a - B) 1 tanatan 3 1 +

cos(a + 3) cos (a - B) 1 tanatan 3 1 + tanatan 3

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