Math, asked by tanirikahanotia, 11 months ago

find cos 75 if cos(A+B)= cosA.cosB-SinAsinB

Answers

Answered by sanyogita14675

0

Ans issss 11111

Ok

hope it helps you

Answered by dilliprasaddhakal528

1

cos75 = cos (45+30)

=cos45.cos30- sin45.sin30

=1/root2×root3/2 -1/root2×1/2

= root3/2root2 - 1/2root2

=(root3-1) /2root2

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