Question

Cos^-1 ( 2/3x ) + cos^-1 ( 3/4x ) = 90 then x is

Answer 1

Answer:

2/3x ) + cos^-1 ( 3/4x ) = 90 then x is

Step-by-step explanation:

cos^2(A+120°) +cos^(A-120°)=1.5sin 3x + sin 2x - sin x = 4sin x

cos (x/2) cos (3x/2)

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