Question

sin 12° sin 24° sin 48° sin 84° = ?
(a). cos 20° cos 40° cos 60° cos 80°
(b) sin 20° sin 40° sin 60° sin 80°
(c) 3/16
(d) 1/16​

Answer 1

Answer:

1/16

Step-by-step explanation:

sin12° sin24° sin48° sin84°

= {1/4 * sin3/12/sin72) (1/4sin3(24)/sin36)

= (sinAsin(60+A)sin(60-A)=1/4sin3A)

= 1/16 * sin36/sin72 *sin36/sin72

= 1/16

hope you will understand

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Answer 2

Answer:

cos20.cos40.cos60.cos80