Question

find the value of sin105°​

Answer 1

Answer:

sin (105) = sin (15 + 90) = cos 15. Apply the trig identity: cos2x=2cos2x−1. sin(105)=cos(15)=√2+√32.

Answer 2

Answer:

(1+ √3)/2√2

Step-by-step explanation:

given that ; sin 105° = sin (90 +15)

= cos 15°

= cos 15° = cos ( 60°-45°) = cos 60° cos 45° + sin 60° sin 45°

= 1/2 .1/√2 + √3/2.1/√2. = (1+√3)/ 2√2

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