Q. 12 B3.7( 6 Votes )
Let us write whet
Answer :
(i) The statement is true
⇒ cos54° = cos(90 - 36)°
= sin36°
[cos(90 - θ) = sinθ]
∴ the value of cos54° and sin36° has same values
(ii) The given statement is False
⇒ sin12° - cos78°
⇒ sin12° - cos(90 - 12)°
⇒ sin12° - sin12°
= 0
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