If a2sec2x - b2tan2x = c2 then the value of sec2x + tan2x is equal to (assume b2 ≠ a2 )

• b2-a2+2c2b2+a2
• b2+a2-2c2b2-a2
• b2-a2-2c2b2+a2
• b2-a2b2+a2+2c2