Question

Evaluate 15 sec²27-15 cot²63=?

Answer 1

Answer:

15sec²27° – 15cot²63°

= 15sec²(90° – 63°) – 15cot²63°

= 15cosec²63° – 15cot²63°

= 15(cosec²63° – cot²63°)

= 15 × 1

= 15

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Answer 2

Answer:

0

Step-by-step explanation:

15sec²27 - 15cos²63

15(sec²27 - cos²63)

15[sec²27 - cos²(90-63)]

15( sec²27 - sec²27)

15×0

0