Math, asked by shivamkaushal0pc0anp, 1 year ago

plz solve 151 question

Attachments:

siril: Multiply and divide with sin20, then sin40, and then sin80

siril: the formulas used are sin(160) = sin(180-20) = sin20

siril: ok

Answers

Answered by NKBrainly

here is your answer...... option B 1/8
plz mark brainliest

Answered by siril

→ cos20cos40cos80

Multiply and divide with 8sin20

→ 8sin20cos20cos40cos80/8sin20

→ 4sin40cos40cos80/8sin20 (∵ 2sinAcosA = sin2A)

→ 2sin80cos80/8sin20

→ sin160/8sin20 (∵sin(160) = sin(180-20) = sin20)

→ sin20/8sin20

→ 1/8

Hope it helps!!

siril: : )

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