Question

Evaluate 5tan 45° tan 39° tan 51° sin 30° cos 60°​

Answer 1

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Step-by-step explanation:

ANSWER ::

5tan 45° tan 39° tan 51° sin 30° cos 60°

= 5 × 1 × tan 39° × tan(90° - 39°) × (1/2)×(1/2)

= 5/4 × tan 39° × cot 39°

= 5/4 ×1

= 5/4