21is thread me karna kya hai ?
do v hav to guess the book or WAT?
or yeh cot vala kuch PROVE karna hai ya aisa kuch
good trigonometry questions for iitjee
\large 1-\cot 23^{\bullet }=\frac{2}{1-\cot 22^{\bullet }}
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10 Answers
2121wat is da questn here?
JEE mein to options bhi hote hai. they also tell u wat do u hav to do wid the data given!!!
mathie kuch editing karo yaar
1tapan take it easy yaar pehle jee subjective tha tabhi ye Q aaya hoga
1\text{Consider LHS} \\ 1-cot23=1-tan67 \\ \Longrightarrow 1-tan67=1-tan(45+22) \\ \Longrightarrow 1-(\frac{tan45+tan22}{1-tan45tan22}) \\ = \frac{1-tan22-1-tan22}{1-tan22} \\ = \frac{-2tan22}{1-tan22} \\ = \frac{2tan22}{tan22-1} \\ \text{Divide numerator and denominator by tan22} \\ = \frac{2}{1-cot22}
PS:Source of this question is Titu Andreescu!
39yup right. its from 103 problems in trigonometry. the second one came in iit direct.