tolong buktikan make cara yaa

[ t = x ]

a.

secx = sinx (tanx + cotx)

secx = sinx (sinx/cosx + cosx/sinx)

secx = sinx (sin²x + cos²x / sinxcosx)

secx = sinx (1 / sinxcosx)

secx = 1 / cosx

secx = secx

b.

2sin²x + cos²x = csc²x + 1 / csc²x

2sin²x + cos²x = csc²x/csc²x + 1/csc²x

2sin²x + cos²x = 1 + 1/(1/sin²x)

2sin²x + cos²x = 1 + sin²x

2sin²x + cos²x = 1 - sin²x + 2sin²x

2sin²x + cos²x = 2sin²x + cos²x