1- cos 2A
19. Using the formula, sin A=
find the value of sin 30°, it
2
1
being given that cos 60° ==.
2
Answers
Answered by
1
Answer:
sin30°=1/2
Step-by-step explanation:
we know sin²A = (1-cos2A)/2
let A= 30°
sin²30 = (1 - cos60)/2
sin²30 = (1 - 1/2)/2
sin²30 = 1/4
sin30 = √(1/4) = 1/2
Similar questions
Computer Science,
3 months ago
Math,
3 months ago
Math,
3 months ago
English,
7 months ago
Social Sciences,
7 months ago
Economy,
11 months ago