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ICSE Class 9 Answered

how do u solve this  solve for x  1) 2cos (3x-15) =1 2) cos x divided  by 3 -1=0
Asked by cibysunny | 09 Jan, 2019, 05:07: PM
answered-by-expert Expert Answer
2cos(3x - 15) = 1
cos(3x - 15) = 1/2
3x - 15 = 60                     As cos60 = 1/2
3x = 75
x = 25
Answered by Sneha shidid | 10 Jan, 2019, 11:03: AM
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