Q. 20

# Mark the Correct alternative in the following:The value of isA.B. 0C. D.

Given expression is

[using the identity sin2 x + cos2 x = 1]

[using the formula a2 + b2 = (a + b)2 – 2ab]

[ using the sum of angle formula ]

[Using the identity cos (A+B) – cos (A-B) = -2sinAsinB ]

[multiplying and dividing the term cos2 x with 2]

[using the cos 2θ = 2cos2 θ – 1]

Hence the answer is option A.

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
Trigonometric Functions - 0152 mins
Conditional Identities31 mins
Transformation formula in compound angles | Interactive Quiz37 mins
Graphs of trigonometric ratios | Trigonometric Identities39 mins
Trigo ratios for compound angles48 mins
Trigonometry ratios of allied angles | Interactive Quiz38 mins
Quiz on Graph of Trigonometric Ratios40 mins
Trigonometric Ratios of Multiple & Sub Multiple Angles40 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