This question was asked in Ex 3.3, 1

Trigonometric Formula and identity of 

Sec(2pi-x)

cosec(2pi-x)

Sec x + sec y 

Sec x - sec y 

Codec x + cosec y

Codec x - cosec y

2 tan x cot y

2cot x tan y 

2cot x cot y

-2tan x tan y

2 sec x cosec y

2cosec x sec y

-2 sec x sec y

2 cosec x cosec y

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