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11 May, 09:07

1. sin (x+20) = cos (2x+10)

2. sin (2x+14) = cos (x-5)

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Answers (1)
  1. 11 May, 09:32
    0
    x=20°

    2.

    x=27°

    Step-by-step explanation:

    sin (x+20) = cos (2x+10)

    =sin (90 - (2x+10))

    so x+20=90 - (2x+10)

    x+20+2x+10=90

    3x=90-30

    3x=60

    x=60/3=20

    2.

    2x+14+x-5=90

    3x+9=90

    3x=90-9=81

    x=81/3=27
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