Sin 20° · sin 40° · sin 80° = 1/2 ( cos 20° - cos 60° ) · sin 80° =
= 1/2 ( cos 20° sin 80° - cos 60° sin 80° ) =
= 1/2 ( (sin 100° + sin 60°)/2 - 1/2 sin 80° )= ( sin 100° = sin 80° )
= 1/2 · ( 1/2 sin 60° ) = 1/4 sin 60° = √3 / 8
sin 60° = √ 3/2
√ 3 / 2 · √ 3 / 8 = 3/16 ( correct )
They are not equivalent fractions.
Answer:
Don't know but
Step-by-step explanation:
The 13th question. The order of operations is Parentheses, Exponents, Multiplication and or division, addition and or subtracting. I can't do the entire thing but 3^{2} =9
Hello,
4+0j=4(cos 0+j*sin 0)
3+4j=√5(cos 53.1301...°+j*sin 53.130102...)
2-2j=2√2(cos 45°-j*sin 45°)
