A+B; A-B......

Geometry Level 2

If sin ⁡ ( A + B ) = 1 \sin(A+B) = 1 then cos ⁡ ( A − B ) \cos(A-B) can be reduced to.......

CosB SinA Sin2B Cos2B

Ojasee Duble by Ojasee Duble , 19, India

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1 solution

Amal Hari
Jan 3, 2019

sin(90)=1

A+B=90

cos(A-B)= cos(A+B -2B),

cos(90-2B)=sin(2B)

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