Answer:
made a mistake in step 3
Step-by-step explanation:
from step2; 1/3k=15 then making k the subject ,k=15*3 so the value of k will be 45
Given:
Consider the expression is

To find:
The value of given expression using a suitable identity.
Solution:
We have,

Using the identity
, we get



Therefore, the value of the given expression is
.
Answer:

Step-by-step explanation:




