Ah, bah, tough! I can barely recall that proof now—something about writing tan²A as sin²A/cos²A and using sin²A+cos²A=1? I must confess, when my own maths teacher was explaining these identities, I was busy daydreaming about football. Now, as I teach Class V, I see that same distracted look in some students and I think, "kiba ase? I was exactly like you.
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