Advertisements
Advertisements
प्रश्न
Express the following as the sum or difference of sine or cosine:
`cos (7"A")/3 sin (5"A")/3`
Advertisements
उत्तर
`= 1/2 [2 cos (7"A")/3 sin (5"A")/3]` ...[Multiply and divide by 2]
`= 1/2 [sin ((7"A")/3 + (5"A")/3) - sin ((7"A")/3 - (5"A")/3)]`
`= 1/2 [sin (12"A")/3 - sin (7"A" - 5"A")/3]`
`= 1/2 [sin 4"A" - sin (2"A")/3]`
APPEARS IN
संबंधित प्रश्न
Prove that:
Prove that:
sin 20° sin 40° sin 80° = \[\frac{\sqrt{3}}{8}\]
Prove that:
sin 10° sin 50° sin 60° sin 70° = \[\frac{\sqrt{3}}{16}\]
Show that:
sin A sin (B − C) + sin B sin (C − A) + sin C sin (A − B) = 0
Prove that:
sin 40° + sin 20° = cos 10°
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° =
The value of sin 50° − sin 70° + sin 10° is equal to
Prove that:
tan 20° tan 40° tan 80° = `sqrt3`.
Prove that:
`(cos 7"A" +cos 5"A")/(sin 7"A" −sin 5"A")` = cot A
