Q. 2 C5.0( 1 Vote )

# Let us show that:cos2 75° - sin215° = 0

Given, cos275° - sin215°

Need to prove the given equation as zero

we know that cos(90 - θ) = sinθ

cos75° = cos(90 - 15)°

= sin15° - - - eq (1)

Substitute eq(1) in the given equation

cos275° - sin215° =

sin215° - sin215° = 0

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
Quiz | Task on Trigonometric Ratios46 mins
T- Ratios of Specified Angles58 mins
Quiz on Trigonometric Ratios31 mins
Trigonometric Identities33 mins
Champ Quiz | Trigonometric Identities33 mins
Testing the T- Ratios of Specified Angles57 mins
NCERT | Trigonometric Identities52 mins
Trigonometric Identities44 mins
Trick to learn all Trigonometric Formulae28 mins
Solving NCERT Questions on Trigonometric Identities56 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