Question

(1-CosA) (1+cosA) =? ​

Answer 1

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It is (cosec A-cot A)^2

Explanation:

At first multiply and divide this with (1-cos A)

(1-cosA)/(1+cosA)*(1-cosA)/(1-cosA)

=(1-cosA)^2/(1-cos^2A)

=(1-cosA)^2/sin^2A

=(1/sinA-cosA/sinA)^2

=(cosecA-cotA)^2

Answer 2

Answer:

Heya!!! 1- Cos a = 2 Sin? (a / 2) %3D And 1+ Cos a = 2 Cos 2 (a/ 2) %3D 1- Cos a / 1+ Cos a Tan? (a / 2) Have a nice day ahead.