1. 26.
    +3
    a = (1/2) c

    a/c = 1/2 = sin 30° = cos 60°
    Continuing
    sin2 30° = 1/4
    But
    sin2 30° + cos2 30° = 1
    So
    1/ 4 + cos2 30° = 1
    Subtract 1/4 from both sides

    cos2 30° = 3/4

    cos 30° = SQRT(3)/ SQRT(4) = SQRT(3)/2 = 1.7320508/2

    cos 30° = 0.8660254 = sin 60°
    a = (1/2) c

    a/c = 1/2 = sin 30° = cos 60°
    Continuing
    sin2 30° = 1/4
    But
    sin2 30° + cos2 30° = 1
    So
    1/ 4 + cos2 30° = 1
    Subtract 1/4 from both sides

    cos2 30° = 3/4

    cos 30° = SQRT(3)/ SQRT(4) = SQRT(3)/2 = 1.7320508/2

    cos 30° = 0.8660254 = sin 60°
    76. sin 3 sin 78. sinx sin 5x 83. 84. cos 120 cos 30 sin 60 sin 30 5 3 85. 86. sin 4 sin 4 cos 3 4 cos 4 In Exercises 87–90,

    87-90.2=0
    -3.2=0
    -6=0 :(

    olmuyor panpa
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