Alguien puede resolver paso a paso este ejercicio?

Resolución ejerciio 1 :

<img src="https://tex.z-dn.net/?f=%28ctg%5E%7B2%7Dx%2B1%29%2Asen%5E%7B2%7Dx%3D1%5C%20si%20%5Crecuedas%5C%20que%5C%20csc%5E%7B2%7Dx%3D1%2Bctg%5E%7B2%7Dx%5C%20entonces%3A%5C%5C%20csc%5E%7B2%7Dx%2Asen%5E%7B2%7Dx%3D1%5C%5C%20%5Cfrac%7B1%7D%7Bsen%5E%7B2%7Dx%7D%2Asen%5E%7B2%7Dx%3D1%5C%20simplifico%5C%5C%201%3D1%20" />

Resolución ejercicio2 :

<img src="https://tex.z-dn.net/?f=%5Cfrac%7Bctg%5E%7B2%7Dx-cos%5E%7B2%7Dx%7D%7Bcsc%5E%7B2%7Dx-1%7D%3Dcos%5E%7B2%7Dx%5C%20si%20recuerda%20%5C%20que%3A%20csc%5E%7B2%7Dx%3D1%2Bctg%5E%7B2%7Dx%5C%5C%20%5Cfrac%7Bctg%5E%7B2%7Dx-cos%5E%7B2%7Dx%7D%7Bctg%5E%7B2%7Dx%7D%3Dcos%5E%7B2%7Dx%5C%20distribuyo%20%5C%20el%20%5C%20denominador%5C%5C%20%5Cfrac%7Bctg%5E%7B2%7Dx%7D%7Bctg%5E%7B2%7Dx%7D-%5Cfrac%7Bcos%5E%7B2%7Dx%7D%7Bctg%5E%7B2%7Dx%7D%3Dcos%5E%7B2%7Dx%5C%5C%201-%5Cfrac%7Bcos%5E%7B2%7Dx%7D%7B%5Cfrac%7Bcos%5E%7B2%7Dx%7D%7Bsen%5E%7B2%7Dx%7D%7D%3Dcos%5E%7B2%7Dx%20%5C%20hago%20%5C%20extremos%20%5C%20y%20%5C%20medios%5C%5C%201-%5Cfrac%7Bcos%5E%7B2%7Dx%2Asen%5E%7B2%7Dx%7D%7Bcos%5E%7B2%7Dx%7D%3Dcos%5E%7B2%7Dx%5C%5C%201-sen%5E%7B2%7Dx%3Dcos%5E%7B2%7Dx%20%5C%20si%20%5C%20recuerdas%20%5C%20que%5C%20sen%5E%7B2%7Dx%2Bcos%5E%7B2%7Dx%3D1%5C%5C%20cos%5E%7B2%7Dx%20%3Dcos%5E%7B2%7Dx%20" />

AHORA AYUDAME TU MARCANDOLA COMO LA MEJOR RESPUESTA.

GRACIAS.