Question
In Problems $37-54,$ use Fundamental Identities and/or the Complementary Angle Theorem to find the exact value of each expression. Do not use a calculator.$$\tan 20^{\circ}-\frac{\cos 70^{\circ}}{\cos 20^{\circ}}$$
Step 1
This gives us: $$ \tan 20^{\circ}-\frac{\sin (90^{\circ}-70^{\circ})}{\cos 20^{\circ}} $$ Show more…
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