Exercise 8.4 question 5 part iii class 10
Strategy 🤯:
Express tan θ and cot θ in sin θ and cos θ
Prove:
tanθ/(1-cotθ)+cotθ/(1-tanθ)=1+secθ cosecθ
or
tan theta upon 1 - cot theta + cot theta upon 1 - tan theta = 1 + sec theta cosec theta
Hint 💡
Trigonometric identity:
cos2 A + sin2 A = 1
1 + tan2 A = sec2 A
cot2 A + 1 = cosec2A
Algebraic Identity
(a+b)^2 = a^2 + b^2 + 2ab
(a+b)^3 = (a+b)(a^2 -ab + b^2)
a^2 - b^2 = (a-b)(a+b)
Note📝
The above question is taken from NCERT book Ch-8 exercise 8.4 question 5 part 3 Trigonometry.
Read it 📖
Identity:
An equation is called an identity when it is true for all values of the variables involved in it.
Trigonometric identity :
Similarly, an equation involving trigonometric ratios of an angle is called a trigonometric identity, if it is true for all values of the angle(s) involved.
Practice👩🏫:
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