Question

Expand that

${cos}^{2} 15 - {sin}^{2} 15$

Answer 1

$\huge{Hello Friend}$

The answer of u r question is..✌️✌️

Given,

Cos^2 15- sin^2 15

Here

tita= 15°

Cos 2(15°)

=cos 30

$= \sqrt{ \frac{3}{2} }$


Thank you..⭐️⭐️⭐️

Answer 2

hey mate

here is your answer

we know

cos 2A=cos ²A- sin²A

thus

cos 2*15= cos 30

=√3/2

and cos ²A-sin²A

can be written as( cos A-sin A)(cos A+sin A)