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ND🎯 Complementary Angles Made Simple!
Struggling with Trigonometry? Start here 👇
These formulas are known as 90° − θ rules and they often come in NDA and CDS exams:
🟢 sin(90° − θ) = cosθ
🔵 cos(90° − θ) = sinθ
🟢 tan(90° − θ) = cotθ
🔵 cot(90° − θ) = tanθ
🟢 sec(90° − θ) = cosecθ
🔵 cosec(90° − θ) = secθ
💡 Tip to Remember:
Just switch the pair – sin ↔ cos, tan ↔ cot, sec ↔ cosec when it’s 90° minus θ!
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