Prove : 1-tan⁴A = 2sec²A - sec⁴A
Answers
Answered by
3
1 - tan⁴A = LHS
sec²A - tan²A - ( sec²A -1)²
sec²A - (sec²A -1)- ( sec⁴A + 1 - 2 sec²A )
sec²A - sec²A + 1 - sec⁴ A - 1 + 2sec² A
2sec² A - sec⁴ A = RHS :)
sec²A - tan²A - ( sec²A -1)²
sec²A - (sec²A -1)- ( sec⁴A + 1 - 2 sec²A )
sec²A - sec²A + 1 - sec⁴ A - 1 + 2sec² A
2sec² A - sec⁴ A = RHS :)
Similar questions