# Important Formulas Of Trigonometric Ratios For RRB Stage - II

Mathematics is an equally important section for RRB Stage II exam and has an even more abundant importance in some other exams conducted by RRB & SSC. Generally, there are questions asked related to basic concepts and formulas of Ratio & Proportion.

To let you make the most of Mathematics section,

**we are providing important facts related to Mensuration**.**We wish you all the best of luck to come over the fear of Mathematics section.***Also, Railway Exam Stage II is nearby with bunches of posts for the interested candidates in which Mathematics is a major part. We have covered important notes and questions focusing on these prestigious exams.*

**Trigonometry****Important Results :-**

• If tan Î±.tan Î² = 1 then Î± + Î² = 90°

• If sin Î±.sec Î² = 1 then Î± + Î² = 90°

• If cos Î±.cosec Î² = 1 then Î± + Î² = 90°

• If cot Î±.cot Î² = 1 then Î± + Î² = 90°

• If sin Î±.cosec Î² = 1 then Î± + Î² = 180°

• sin² Î¸ + cos² Î¸ = 1 , sin² Î¸ = 1 – cos² Î¸ & cos² Î¸ = 1 – sin² Î¸

• sec² Î¸ – tan² Î¸ = 1 , sec² Î¸ = 1 + tan² Î¸ & tan² Î¸ = sec² Î¸ – 1

• cosec² Î¸ – cot² Î¸ = 1 , cosec² Î¸ = 1 + cot² Î¸ & cot² Î¸ = cosec² Î¸ – 1

• If sin² Î± + sin² Î² = 2 or sin Î± + sin Î² = 2 , then Î± = Î² = 90°

• If sin² + cos² Î² = 2 or sin Î± + cos Î² = 2 , then Î± = 90° & Î² = 0°

• if cos² Î± + cos² Î² = 2 or cos Î± + cos Î² = 2 ,then Î± = Î² = 0°

• sin² Î± + sin² Î² = 0 when Î± = Î² = 0

• sin² Î± + cos² Î² = 0 when Î± = 0 & Î² = 90°

• cos² Î± + cos² Î² = 0 when Î± = Î² = 90°

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