Question

Prove that cos² 30 - sin² 30 = cos 60​

Answer 1

Answer:

(√3/2)2-( 1/2)2

= 3/4-1/4=

Step-by-step explanation:

2/4= 1/2.

cos 60.

Answer 2

Answer:

${ \cos}^{2} 30 - { \sin }^{2} 30 \\ = ( { \frac{ \sqrt{3} }{2} })^{2} - ( { \frac{1}{2} })^{2} \\ = \frac{3}{4} - \frac{1}{4} \\ = \frac{2}{4} \\ = \frac{1}{2} \: \: \: \: which \: is \: the \: value \: os \: cos \: \: 60$

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