4. Express cos 75°+cot75° in terms of angles between 0 and 30
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Answer:
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QUESTION :
Express cos 75°+cot 75° in terms of angles between 0° and 30°
SOLUTION :
➡ cos 75° + cot 75°
- cos ( 90° - ø) = sec ø
➡ cos ( 90° - 25° ) + cot 75°
➡ sec 25° + cot 75°
- cot ( 90° - ø) = tan ø
➡ sec 25° + cot ( 90° - 25° )
➡ sec 25° + tan 25°
Hence, it is proved.....
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Step-by-step explanation:
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