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Cách chuyển từ sin sang cos ạ ?
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Cho hàm số y=ax3+bx2+cx+d có đồ thị như hình vẽ. Tìm mệnh đề đúng
A. a<0, b>0, c>0, d<0
B. a<0, b<0, c>0, d<0
C. a>0, b>0, c>0, d<0
D. a<0, b>0, c<0, d<0
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Solve for x 25^x+5^(x+1)-66=0
Factor the left side of the equation.
Tap for more steps...Rewrite as .
Rewrite as .
Rewrite as .
Let . Substitute for all occurrences of .
Tap for more steps...Evaluate the exponent.
Move to the left of .
Factor using the AC method.
Tap for more steps...Consider the form . Find a pair of integers whose product is and whose sum is . In this case, whose product is and whose sum is .
Write the factored form using these integers.
Replace all occurrences of with .
Replace the left side with the factored expression.
If any individual factor on the left side of the equation is equal to , the entire expression will be equal to .
Set the first factor equal to and solve.
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Add to both sides of the equation.
Take the natural logarithm of both sides of the equation to remove the variable from the exponent.
Expand by moving outside the logarithm.
Divide each term by and simplify.
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Cancel the common factor of .
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Divide by .
Set the next factor equal to and solve.
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Subtract from both sides of the equation.
Take the natural logarithm of both sides of the equation to remove the variable from the exponent.
The equation cannot be solved because is undefined.
Undefined
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No solution
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