Question

cos² 45° – sin² 15º =​

Answer 1

Step-by-step explanation:

Cos²45°-Sin²15=(1/√2)²-(√3-1)²/(2√2)²

=1/2-(3-2√3+1)/8

=1/2-(2-2√3)/8

=1/2-[2(1-√3)]/8

=1/2-(1-√3)/4

=2-1-√3/4

1-√3/4

i hope this answers help you

plz mark me brilliant