Trigonometric Inequality 2cos^2x+sinx less than 2 IIT JEE

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Sir
Sinx less than x, 0 to 1 mein kaise hota hai
Please explain

LokeshLokesh-pszd
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Mai yahi question ke lie dekh rha tha sir

nametosunahihoga
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I don’t understand how 2sin(x) - 1 is negative after 5pi/6… i understood everything until that moment

jarelmontes