Sắp xếp và so sánh các tỉ số lượng giác a) sin 240, cos350, sin 540, cos700, sin 780

b) tan 420, cot 610, tan 280, cot 790, tan 350

b is 38 degrees.

a is 52 degrees.

this is because if b is 38 and a is 14 degrees more than b than 38+14=52 and 52+38=90 degrees. hope this .

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

60°

step-by-step explanation:

the measure angle of c in an isosceles triangle abc is 60° because in isosceles triangle,the measures of all the angles is 60°.

sorry

step-by-step explanation:

sorry, but im pretty sure its a now that i look at it