pls solve this question
Attachments:
Answers
Answered by
0
Answer:
-1/4
Step-by-step explanation:
sin(π/10)sin(13π/10)
=-0.25
=-1/4 (answer)
mark this answer as brainliest answer.
follow me.
hariharan108:
how sin
how 0.25 came
pls answer
I was confused between option 2) and 3) then I have checked in photomath it has shown this much only
You can also check.
Answered by
1
Answer :
-1/4
Explanation, step by step:
sin π/10 × sin 13π/10
=> sin 180/10 × sin 13×180/10
=> sin18 × sin 234
=>(√5-1)/4 × sin(2×90×54)
=>(√5-1)/4 × sin (-54) {2 lies in second quadrant ,since, there is a +ve sign before 54 so it will be shifted to the third quadrant}
=> (√5-1)/4 × (-√5-1)/4
=> -5+1/16 => -4/16 => -1/4
Similar questions