Advertisements
Advertisements
प्रश्न
Express the following as the sum or difference of sine or cosine:
cos 7θ sin 3θ
Advertisements
उत्तर
= `1/2` [sin(7θ + 3θ) – sin(7θ – 3θ)]
= `1/2` (sin 10θ – sin 4θ)
APPEARS IN
संबंधित प्रश्न
Show that :
Prove that:
sin 20° sin 40° sin 60° sin 80° = \[\frac{3}{16}\]
Prove that:
cos 3A + cos 5A + cos 7A + cos 15A = 4 cos 4A cos 5A cos 6A
Prove that:
If cosec A + sec A = cosec B + sec B, prove that tan A tan B = \[\cot\frac{A + B}{2}\].
If cos (A + B) sin (C − D) = cos (A − B) sin (C + D), prove that tan A tan B tan C + tan D = 0.
If \[m \sin\theta = n \sin\left( \theta + 2\alpha \right)\], prove that \[\tan\left( \theta + \alpha \right) \cot\alpha = \frac{m + n}{m - n}\]
Write the value of sin \[\frac{\pi}{12}\] sin \[\frac{5\pi}{12}\].
If secx cos5x + 1 = 0, where 0 < x ≤ `pi/2`, then find the value of x.
