Advertisements
Advertisements
Question
Express the following as the sum or difference of sine or cosine:
cos 7θ sin 3θ
Advertisements
Solution
= `1/2` [sin(7θ + 3θ) – sin(7θ – 3θ)]
= `1/2` (sin 10θ – sin 4θ)
APPEARS IN
RELATED QUESTIONS
Prove that:
sin 38° + sin 22° = sin 82°
Prove that:
sin 105° + cos 105° = cos 45°
Prove that:
Prove that:
sin (B − C) cos (A − D) + sin (C − A) cos (B − D) + sin (A − B) cos (C − D) = 0
Write the value of the expression \[\frac{1 - 4 \sin 10^\circ \sin 70^\circ}{2 \sin 10^\circ}\]
Write the value of \[\sin\frac{\pi}{15}\sin\frac{4\pi}{15}\sin\frac{3\pi}{10}\]
sin 163° cos 347° + sin 73° sin 167° =
If A, B, C are in A.P., then \[\frac{\sin A - \sin C}{\cos C - \cos A}\]=
Express the following as the sum or difference of sine or cosine:
cos(60° + A) sin(120° + A)
Express the following as the product of sine and cosine.
cos 2θ – cos θ
