Question

Cos 36 X sec (90-3A) = 1; Find the value of A​

Answer 1

Answer:

$42^0$

Step-by-step explanation:

$cos 36^o * sec(90-3A)^o = 1\\cos36^o = \frac{1}{sec(90^o-3A)}\\cos36^o = cos(90^o-3A)\\=> 36^o = 90^o - 3A\\3A = 90^o+36^o\\3A = 126^o\\A = 42^o$