Answer :
LHS = cos 24° + cos 55° + cos 125° + cos 204° + cos 300°
= cos 24° + cos (90° × 1 – 35°) + cos (90° × 1 + 35°) + cos (90° × 2 + 24°) + cos (90° × 3 + 30°)
We know that when n is odd, cos → sin.
= cos 24° + sin 35° - sin 35° - cos 24° + sin 30°
= 0 + 0 + 1/2
= 1/2
= RHS
Hence proved.
Rate this question :
How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
view all courses
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
RELATED QUESTIONS :
Prove that :
<
prove that :
<
Prove that:
</
Find the values o
RD Sharma - MathematicsFind the values o
RD Sharma - MathematicsFind the values o
RD Sharma - MathematicsFind the values o
RD Sharma - Mathematicsprove that :
<
Prove that:
</
Find the values o
RD Sharma - Mathematics