This Trigo Identity Trick Saves Time in SSC Mains!📐
Автор: GlobalMathX
Загружено: 2025-12-21
Просмотров: 68
Описание:
Advanced SSC CGL Mains trigonometry identity problem! 📐
Question: (1+sinA)(1-sinA)(1+tan²A) = ?
Solution Strategy:
Step 1: Use identity (1+sinA)(1-sinA) = 1-sin²A
Step 2: Apply 1-sin²A = cos²A
Step 3: Use identity 1+tan²A = sec²A
Step 4: Simplify cos²A × sec²A
Step 5: cos²A × sec²A = cos²A × (1/cos²A) = 1 ✅
Key Identities to Remember:
💡 1-sin²θ = cos²θ
💡 1+tan²θ = sec²θ
💡 sec²θ = 1/cos²θ
This appears in:
✅ SSC CGL Tier 2 (Mains)
✅ Advanced trigonometry sections
Master these identities for Mains success! 📚
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