Question

tratiy v
$\sqrt( \sec ^{2} a + \csc {}^{2} a$
​

Answer 1

Step-by-step explanation:

4a+7b/4c+7d=4a-7b/4c-7d

(4a+7b)(4c-7d) =(4a-7b)(4c + 7d)

16ac -28ad + 28bc -49bd = 16ac + 28ad - 28bc - 49bd

56bc = 56ad

bc = ad

c/d = a/b

a/b = c/d

QED Proved