Mark the tick against the correct answer in the following:
To find: Value of 
Formula used: (i) 
We have, 
On expanding the above,
⇒ {cos 15°} {cos 15°} – {sin 15°} {sin 15°}
On applying formula 
= cos (15 + 15)
= cos (30°)
1
Mark the tick against the correct answer in the following:
To find: Value of
Formula used: (i)
We have,
On expanding the above,
⇒ {cos 15°} {cos 15°} – {sin 15°} {sin 15°}
On applying formula
= cos (15 + 15)
= cos (30°)