The answer is D.The triangles are similar by the SSS similarity theorem.
(csc x-1)(csc x+1)=csc²x-1²=csc²x-1=(1/sin x)² -1=1/sin x² - sin²x/sin²x=
=(1-sin²x)/sin² x = cos² x/ sin² x = (cos x/sin x)²= (cot x)²
Step-by-step explanation:
7 (-12) = -84
it's literally -84
