Ex 3.3, 8 - Chapter 3 Class 11 Trigonometric Functions (Term 2)
Last updated at Feb. 12, 2020 by Teachoo
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Chapter 3 Class 11 Trigonometric Functions
Serial order wise
- Ex 3.1
- Ex 3.2
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Ex 3.3
- Ex 3.4
- Examples
- Miscellaneous
Transcript
Ex 3.3, 8 Prove that cosβ‘γ (Ο + π₯) cosβ‘γ(β π₯)γ γ/(sinβ‘γ (Ο β π₯)γ cosβ‘γ"(" Ο/2 " + " π₯")" γ ) = cot2 π₯ Taking L.H.S. πππ β‘γ(π + π₯) γπππ γβ‘γ(βπ₯)γ γ/(π ππβ‘(π β π₯) πππ β‘γ"(" π/2 " + " π₯")" γ ) Putting Ο = 180Β° = πππ β‘γ(180Β° + π₯) γπππ γβ‘γ(βπ₯)γ γ/(π ππβ‘(180Β° β π₯) πππ β‘γ"(" 90Β° "+ " π₯")" γ ) Using cos (180Β° + x) = βcos x cos (βx) = cos x sin (180Β° β x) = sin x & cos(90Β° + x) = βsin x = (βπππ β‘γπ₯ Γ πππ β‘π₯ γ)/((sinβ‘γπ₯) Γγ(βsinγβ‘π₯) γ ) = (βπππ 2π₯)/(βπ ππ2π₯) = cot2x = R.H.S. Hence proved
