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if sinx1+sinx2+sinx3=3, then write the value of cosx1+cosx2+cosx3

pratibha , 7 Years ago
Grade 11
anser 2 Answers
Ravneet

Last Activity: 7 Years ago

sinx1 + sinx2 + sinx3 = 3
this can only be possible when sinx1 = sin2 = sinx3 = 1
becouse maximum value sinx can take is 1  
so we can say that x1 = x2 = x3 = 90
therefore, cosx1 + cosx2 + cosx3 = 0 
sukumar sawant

Last Activity: 4 Years ago

sin is a function who maximum value is 1
so the given eqn can ony be true if  sin x1 = 1 , sinx2 = 1 , sin x3 = 1
so x1=x2=x3= 90 or pi/2
so 
cos 90+ cos 90+cos90 = 0 
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