cos 10 / (cos 40 . cos 50)
= cos 10 / ( 1/2( cos(40 + 50) + cos(40 - 50) ) )
= cos 10 / ( 1/2( cos 90 + cos(-10) ) )
= cos 10 / ( 1/2( 0 + cos 10 ) )
= cos 10 / ( 1/2(cos 10) )
= 1 / (1/2)
= 2
maka nilai dari cos 10 / (cos 40 . cos 50) adalah 2
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cos 10 / (cos 40 . cos 50)
= cos 10 / ( 1/2( cos(40 + 50) + cos(40 - 50) ) )
= cos 10 / ( 1/2( cos 90 + cos(-10) ) )
= cos 10 / ( 1/2( 0 + cos 10 ) )
= cos 10 / ( 1/2(cos 10) )
= 1 / (1/2)
= 2
maka nilai dari cos 10 / (cos 40 . cos 50) adalah 2