1.

SinA by 1 ➕ cosA ➕ sinA by 1 ➖ cosA

Answer»

Step-by-step EXPLANATION:

sinA/1+cosA + sinA/1-cosA

=sinA[1/1+cosA+1/1-cosA]

=sinA[1-cosA+1+cosA/1-cos²A]

=sinA[2/sin²A]

=2/sinA

=2cosecA



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