Question

If sinA=cosA then find the value of 2tan²A-2sec²A+5

Answer 1

hey friend 
it will be,
2(sin²A/COS²A)-2(1/cos²A)+5
if sinA=cosA
then,
2sin²A/sin²A-2(1/cos²A)+5
2-2(1/cos²A)+5
2{1-(1/cos²A)}+5   OR    2{1-sin²A}+5

hope it helps
thanks