try to solve, if u you are a master in trignometry
Attachments:
Answers
Answered by
1
Aapka class Kya hai...
darksnout2:
10th
Answered by
0
RHS=> 9+1/2 = 19/2
LHS=> sin²5° + sin²10° +....+ sin²45° +....+ sin²80° + sin²85° + sin²90°
=> cos²85° + cos²80° +....+1/2 +....+ sin²80° + sin²85° + 1
=> cos²85° + sin²85° + cos²80° + sin²80° +....+ cos²40° + sin²40° + 1/2+1
=> 1 +1+1+1+1+1+1+1 +1/2+1 (cos²A+sin²A=1)
=>9+1/2
=> 19/2
LHS=> sin²5° + sin²10° +....+ sin²45° +....+ sin²80° + sin²85° + sin²90°
=> cos²85° + cos²80° +....+1/2 +....+ sin²80° + sin²85° + 1
=> cos²85° + sin²85° + cos²80° + sin²80° +....+ cos²40° + sin²40° + 1/2+1
=> 1 +1+1+1+1+1+1+1 +1/2+1 (cos²A+sin²A=1)
=>9+1/2
=> 19/2
but what about sin 45 it is 1/root 2
I can't understand...
ok sorry it is whole square
I'm class 8th student
bhai tari bas no bat nahi ha
ya 10th class ka ha
yup it is whole square so 1/2
Thanks for marking brainliest ;-)
Similar questions