Q. 14.2( 5 Votes )

# Express each of t

Answer :

i. sin 12x + sin 4x  = 2 sin 8x cos 4x

ii. sin 5x – sin x  = 2 cos 3x sin 2x

iii. cos 12x + cos 8x  = 2 cos 10x cos 2x

iv. sin 2x + cos 4x

= sin 2x + sin (90° - 4x)   = 2 sin (45° - x) cos (3x – 45°)

= 2 sin (45° - x) cos {-(45° - 3x)}

{cos (-x) = cos x}

= 2 sin (45° - x) cos (45° - 3x)

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
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

Prove that:
</
RD Sharma - Mathematics

Prove that:
</
RD Sharma - Mathematics