Domain and Range of Secant, Cosecant and Cotangent

[@youngteacher3644]

While multiplying through by 1/2 in the example 2 of the cosecant the csc2(x+3) was not multiplied...Please can i know the reason

[@nadeemnizami7603]

Sir the period of sin^2x + cos^2x is???

[@theboyzsalty6094]

i don't get how pi + (pi)(n) and (pi)(n) is the same