Answer:
only B wrong
Step-by-step explanation:
sin0 =15/17 (1 quadrant)
sin0=Opposite/hypothenous
use pythagoras theorem,
adjadcent=√17²-15²
=√289-225
=√64
=8
cos0=Adjadcent/hypothenous
=8/17
sec0=1/cos0
=1/(8/17)
=17/8
cosec0=1/sin0
=1/(15/17)
=17/15
tan0=sin0/cos0
=(15/17)/(8/17)
=15/8
'D'
本题已由中国数学会官方解答（现有会员：3人）
its an eqilateral triangle. they are always “positioned” at 180 degrees.
2/3 is quotient.
2/3÷4/5=(2×5)/(3×4)=10/12=5/6
