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PIease help me solve some of questions in steps . 1.Evaluate cos28°.cos32°-sin28°.sin32° 2.Sin^2(120°-A) + sin^2 A + sin ^2(120° + A) 3.cos(a+b)=4/5 and sin(a-b)=5/13 and A and B lies in range of 0°-45° ,find the value of tan2a ? I am aiming to recover my basics. I have no reference book with me but just a question bank at the moment .So please help me solve some of these questions ?

PIease help me solve some of questions in steps . 1.Evaluate cos28°.cos32°-sin28°.sin32° 2.Sin^2(120°-A) + sin^2 A + sin ^2(120° + A) 3.cos(a+b)=4/5 and sin(a-b)=5/13 and A and B lies in range of 0°-45° ,find the value of tan2a ?


I am aiming to recover my basics. I have no reference book with me but just a question bank at the moment .So please help me solve some of these questions ?

Grade:

1 Answers

Sunil Raikwar
askIITians Faculty 45 Points
7 years ago
please checked the attached file

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