Question

if (1+cosA)(1-cosA)=4,then find the value of cosecA​

Answer 1

Answer:

1/2

Step-by-step explanation:

Using,

$(a + b) (a - b) = ( {a}^{2} - {b}^{2} )$

(1+cosA)(1-cosA) = 4

1 - (cosA)^2 = 4

( SinA)^2 = 4

SinA = 2

Therefore,

CosecA = 1/2

Answer 2

Answer:

yes,above answer is right

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