sin a=4/10 berapa nilai cos a? dan tan a?

smoga membantush_!

#jika krg jls tolong ditnyainn

Kelas 10 Matematika
Bab Trigonometri Dasar

Sin a = 4/10 → y/r

x = √(r² - y²)
x = √(10² - 4²)
x = √(100 - 16)
x = √84
x = √4 . √21
x = 2√7

cos a = x/r
cos a = (2√7)/10
cos a = (1/5) √7

tan a = y/x
tan a = 4/(2√7)
tan a = (2/√7) . (√7)/(√7)
tan a = (2/7) √7