11th Math Practical No.3 Trigonometry-2. Answer Solution | Maharashtra Board HSC Board | Balbharati |

      

11th Std Math Practical

Mathematics and Statistics (Arts and Science)

Answers (Solutions)

Practical  No.3

2) Trigonometry-2

Practical Session No. 3-Trigonometry-2

11th-Math-Practical-No-3-Trigonometry-2-answer-solution-Balbharati-Maharashtra-Board-HSC-Board

Let's see What you will Study in these Chapters

• Aim
• Apparatus
• Diagram
• Farmula
• Theory :
• Procedure:
• Observations/Table
• Result :
• Calculation : 
• MCQ :
• Short Answer Questions :

Practical Session No. 3

Trigonometry -2

(1) Show that (cos𝜃𝜃+𝑖 sin𝜃𝜃)3=cos3𝜃𝜃+𝑖 sin3𝜃𝜃

(2) Show that cos3𝜃𝜃−sin3𝜃𝜃 =(cos𝜃𝜃+sin𝜃𝜃)(1−2sin2𝜃𝜃)

(3) Prove that cos2𝜃𝜃+cos2(𝜃𝜃+1200)+cos2(𝜃𝜃−1200)=32

(4) If 𝐴𝐴+𝐵 +𝐶𝐶=𝜋𝜋 then prove that

cos2𝐴𝐴+cos2𝐵 +cos2𝐶𝐶=1−2cos𝐴𝐴cos𝐵 cos𝐶𝐶.

Hence prove that cos600=12.

(5) Find the values of sin180 and cos180.

(6) If tan𝐴𝐴=56 and tan𝐵 =111 then show that 𝐴𝐴+𝐵 =𝜋𝜋4 𝑜𝑜𝑜𝑜5𝜋𝜋4.

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