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Math Help - Trigonometric Ratios of Allied angles

  1. #1
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    Trigonometric Ratios of Allied angles

    Prove that sin(90+theta)=sin(theta) without using trigonometric identity of sin(a+b). Prove it using circular system of coordinates.
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  2. #2
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    Re: Trigonometric Ratios of Allied angles

    Hey andyrk.

    Hint: sin(90+theta) != sin(theta) at all. Have you made a mistake?
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  3. #3
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    Re: Trigonometric Ratios of Allied angles

    please remember sin ( 90 + theta ) = cos ( theta )Trigonometric Ratios of Allied angles-21-jun-13-2.png
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