Evaluate the following without the use of a calculator

MATHEMATICS · Subjective · CBSE · Mathematics · Introduction to Trigonometry · Introduction to Trigonometry

Problem

Evaluate the following without the use of a calculator, showing each step clearly. (i)

\sin 825^{\circ}

(ii)

\cos(-1370^{\circ})

(iii)

\tan 4125^{\circ}

Express each answer in exact form.

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