Introduction to Trigonometry

⭐ Important Questions

1. If sin A = 35, find cos A and tan A.
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   sin A = opphyp = 3/5\nadj = √25-9 = 4\ncos A = 45, tan A = 34
2. Prove: sec⁴ A - sec² A = tan⁴ A + tan² A.
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   LHS = sec² A(sec² A - 1) = (1+tan² A)(tan² A) = tan² A + tan⁴ A = RHS