Find a possible solution to the equation sin(3x+13)=cos(4x).

Re: Find a possible solution to the equation sin(3x+13)=cos(4x).

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Using the fact that sine and cosine are co-functions,

Note that ....[3x + 13] + [4x] = 90

7x + 13 = 90

7x = 77

x = 11

check

sin[3(11) + 13]° = cos [4(11]]°    ???

sin[46]° = cos [44]°    ???

0.719339800339 = 0.719339800339  √