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(Mathematics) , (NCERT) , class X chapter-Quadratic Equations exercise-4.1 question 1 all parts _ i,ii,iii,iv,v,vi,vii and viii

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Question 1) Check whether the following are quadratic equations: i) solution 👇🏻 ii) solution 👇🏻 iii) solution 👇🏻 iv) solution 👇🏻 v) solution 👇🏻 vi) solution 👇🏻 vii) solution 👇🏻 viii) solution 👇🏻

(Trigonometry) Important for board exams

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Prove,            1-sintheta/1+sinthita=(sec theta-tan theta)^2