SOLUTION: Use an addition or subtraction formula to find the solutions (in radians) of the equation that are in the interval [0, π/2).
cos(7t)(cos(t)=-sin(7t)sin(t)
I started by:
Algebra.Com
Question 436816: Use an addition or subtraction formula to find the solutions (in radians) of the equation that are in the interval [0, π/2).
cos(7t)(cos(t)=-sin(7t)sin(t)
I started by:
cos(7t)cos(t)+sint(7t)sin(t)=0
cos(7t-t)=0
cos(6t)=0
Where do I go from here?
Answer by shree840(260) (Show Source): You can put this solution on YOUR website!
cos(6t)=0 so far okay
cos90=0
6t=90
t=15 ANS
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