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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- Jun 21st 2013, 12:27 AMandyrkTrigonometric 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.

- Jun 21st 2013, 01:43 AMchiroRe: Trigonometric Ratios of Allied angles
Hey andyrk.

Hint: sin(90+theta) != sin(theta) at all. Have you made a mistake? - Jun 21st 2013, 05:52 AMibduttRe: Trigonometric Ratios of Allied angles
please remember sin ( 90 + theta ) = cos ( theta )Attachment 28655