((cosx)/(1 + sinx)) + ((cosx)/(1 - sinx)) = 2secx

Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

Leonardo wrote an equation that has an infinite number of solutions. one of the terms in leonardo’s equation is missing, as shown below.

Angie has saved 3/8 of the amount she needs to buy a bike. clive has saved 7/10 of the amount he needs to buy a skateboard. what is the difference between clive's and angie's fraction of savings?