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If y= sin-1(4sinx +3cosx divided by 5) then show that dy/dx=1

take 4/5 as cosa and 3/5 as sina  where a is constant   then u get sin(a+x)    now u get y =a+x  differentiate to prove 1         also cosa=root1-sin​2a 
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Write down negation of following a) 11 20. b) If 15 is even number, then 98 is perfect square.
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