Question

If cos thita +secthita =5by 2 find cos square thita +sec square thita

Answer 1

Answer:

17/4

Step-by-step explanation:

cosA + secA = 5/2

squaring both sides

( cosA + secA)^2 = (5/2)^2

cos^2(A) + sec^2(A)+2cosAsecA = 25/4

cos^2(A) + sec^2(A) +2 = 25/4

cos^(A) + sec^2(A) = 25/4 -2

cos^2(A) + sec^2(A) = 17/4

hope it's helpful