Math, asked by deepachalla, 8 months ago

what is the value of sin 221/2 degrees​

Answers

Answered by jashanpreetkaur77
1

Answer:

here is your answer dear

plzz Mark me as brainliest plzzzzz

Attachments:
Answered by Anonymous
1

Step-by-step explanation:

1 - cos A = 2 sin2 A2

⇒ 2 sin2 A2 = 1 - cos A

⇒ 2 sin2 22½˚ = 1 - cos 45°

⇒ sin2 22½˚ = 1−cos45°2

⇒ sin2 22½˚ = 1−12√2, [Since we know cos 45° = 1√2]

⇒ sin 22½˚ = 12(1−12√)−−−−−−−−√, [Since, sin 22½˚ > 0]

⇒ sin 22½˚ = 2√−122√−−−−√

⇒ sin 22½˚ = 122−2–√−−−−−−√

Therefore, sin 22½˚ = 122−2–√−−−−−−√

Similar questions