Question

5乘以sin105度除以sin30度等于多少?

Answer 1

(5*sin105)/sin30

=[5*sin(60+45)]/(1/2)

=10*(sin60cos45+cos60sin45)

=10*[(根号3/2)*(根号2/2)+(1/2)*(根号2/2)]

=10*[(根号6/4)+(根号2/4)]

=[5*(根号6+根号2)]/2