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CBSE Class 9 Answered

can you say the answer for my holiday assignment .i can't find the answer can someone help me  trignomentry-uses ratios ,special angles and identities  
Asked by SriVaishnavi | 02 Oct, 2018, 09:30: AM
Expert Answer
trigonometry  is used in oceanography in calculating the height of tides in oceans. The sine and cosine functions are fundamental to the theory of periodic functions, those that describe the sound and light waves. Also trigonometry has its applications in satellite systems.
 
Ratios:
begin mathsize 18px style sin space straight x space equals space fraction numerator 1 over denominator cosec space straight x end fraction
cos space straight x space equals space fraction numerator 1 over denominator sec space straight x end fraction
tan space straight x space equals fraction numerator sin space straight x over denominator cos space straight x end fraction
cot space straight x space equals fraction numerator 1 over denominator tan space straight x end fraction end style

special angles:
 
 
identities:
cos2x+sin2x=1
1+tan2x=sec2x
1+ cot2x = cosec2x
Answered by Arun | 04 Oct, 2018, 11:01: AM
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