Q. 2

# Prove that:4(cos310o + sin320o) = 3 (cos10o + sin20o)

We know that

sin (3× 20°)=cos (3× 10°)

3sin 20°–4sin320°=4cos310°–3cos 10°

(as sin 3θ=3sin θ–4sin3 θ and cos 3θ =4cos3θ–3cosθ)

4(cos310°+sin320°)=3(sin 20°+cos 10°)

LHS=RHS

Hence proved

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Trigonometric Ratios of Sub Angles35 mins
Trigonometric Functions - 0568 mins
Trigonometry ratios of allied angles | Interactive Quiz38 mins
Trigonometric Functions - 0152 mins
Quiz on Graph of Trigonometric Ratios40 mins
Graphs of trigonometric ratios | Trigonometric Identities39 mins
Trigo ratios for compound angles48 mins
Conditional Identities31 mins
Transformation formula in compound angles | Interactive Quiz37 mins
Quiz - Trigonometric Ratios of Sub Angles33 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses
RELATED QUESTIONS :

Prove that:

RD Sharma - Mathematics

Prove that:

RD Sharma - Mathematics

Prove that:

RD Sharma - Mathematics

Prove that:

RD Sharma - Mathematics

Prove that:

RD Sharma - Mathematics

Prove that:

RD Sharma - Mathematics

Prove that:

RD Sharma - Mathematics

Prove that:

RD Sharma - Mathematics