2007-04-15 05:51:27 · 7 answers · asked by Monica M 1 in Science & Mathematics ➔ Mathematics
The sin of 60 is equal to the cosine of 30.
because they are complementary
2x + x = 90
3x = 90
x = 30
2007-04-15 05:56:20 · answer #1 · answered by suesysgoddess 6 · 1⤊ 0⤋
x= 30 degrees
2007-04-15 12:57:58 · answer #2 · answered by Scott H 3 · 0⤊ 0⤋
30 degrees
2007-04-15 12:56:46 · answer #3 · answered by sbijapure 2 · 0⤊ 0⤋
sin (2x)=2sinx cosx
you have 2sinx =1 sinx =1/2
x = 30°
x =150°
2007-04-15 13:01:19 · answer #4 · answered by maussy 7 · 0⤊ 0⤋
2sin x.cos x = cos x
cos x.(2sin x - 1) = 0
cos x = 0, sin x = 1/2
x = 90°, 270°, 30°,150°
2007-04-15 13:01:21 · answer #5 · answered by Como 7 · 0⤊ 0⤋
The answer is 30 degrees.
sin(2*30) = sqrt(3)/2
cos(30) = sqrt(3)/2
2007-04-15 12:57:43 · answer #6 · answered by ǝɔnɐs ǝɯosǝʍɐ Lazarus'd- DEI 6 · 0⤊ 0⤋
sin2x - cosx = 0
2sinxcosx - cosx = 0
DO NOT CANCEL THE COSx
cosx*(2sinx-1) = 0
cosx = 0 OR sinx = 1/2
Answers: 30,90,150,270
2007-04-15 12:57:35 · answer #7 · answered by Dr D 7 · 0⤊ 0⤋