Class 11th Maths – RD Sharma Chapter 8 : Trigonometric Formulae – Fill in the Blanks Type Questions (FBQs) Solutions (Step-by-Step Guide)

1. The value of (sin 70° + cos 40°)/(cos 70° + sin 40°) is ………….. Watch Solution
2. If tan(A + B) = p, tan(A – B) = q, then the value of tan 2A in terms of p and q is …………… Watch Solution
3. If 1 + cos 2x + cos 4x + cos 6x = k cos x cos 2x cos 3x, then k = …………. Watch Solution
4. The value of sin 50° – sin 70° + sin 10° is ……………………. Watch Solution
5. The value of 2 cos(π/13) cos(9π/13) + cos(3π/13) + cos(5π/13) is ………….. Watch Solution