Question

Nilai dari 4 sin 75⁰ sin 15⁰ adalah…
a. √2
b. √3
c. 1/2 √2
d. (-1)/2 √2
e. -3√2
jawab yg serius yaa

Answer 1

4 sin 75⁰ sin 15⁰ = 2 [cos[(75°+15°)/2] + cos[(75°-15°)/2]= 2[cos(45°)+cos(30°)] = 2[(1/2.√2+1/2.√3)= √2 + √3