Question

fins the value of sin^2 a - sec^2 a + cos^2 a + tan^2 a

Answer 1

Sin^2 a - Sec^2 a + Cos^2 a + Tan^2 a
= (Sin^2 a + Cos^2 a) - (Sec^2 a - Tan^2 a)
= 1 -1
= 0