buktikan identitas berikut! sinα/1+cosα + 1+cosα/sinα = 2cosecα

(sin α / 1 + cos α) + (1 + cos α / sin α) = 2 cosec α

(sin α / 1 + cos α) + (1 + cos α / sin α)
= (1/cosec α / 1 + cos α) + (1 + cos α / 1/cosec α)
= cosec α + cosec α
= 2 cosec α