Question

(cot A +cosec A) (cot A-cosec A)=​

Answer 1

Step-by-step explanation:

= (cotA +cosecA) (cotA -cosecA)

》Consider the identity

(a+b)(a-b) = a^2-b^2

= cotA^2 -cosecA^2

= cos^2/sin^2 - 1/sin^2

= cos^2-1 / sin^2

》Consider the trigonometric identity

(sin^2x+cos^2x) = 1

or -sin^2 = cos^2 -1

= -sin^2 /sin^2

= -1