If the sin 90º = 1, then which statement is true?

Mathematics

2 answers:

Anuta_ua [19.1K]2 years ago

4 0

Answer:

<em>cos 0° = 1, because the cosine and sine are complements</em>

Step-by-step explanation:

Here is the formula: sin 0 = cos (90°- 0) or cos 0 = sin (90°- 0)

So it would be: cos 0° = sin (90° - 0°) = sin 90° = 1

rosijanka [135]2 years ago

3 0

Answer:

If what the sin 90º

Step-by-step explanation:

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It took sandy two hours to jog 13 miles. She ran 7 1/2 miles in one hour. How far did she run during the second hour

Zarrin [17]

Sandy ran 5 ½ during the second hour.

Total amount Sandy used to jog for 2 hours = 13 miles
Amount Sandy used to run in the 1st hour = 7 ½

<h2>Further Explanation</h2>

Therefore the amount Sandy used to run in the 2nd hour = Total amount Sandy used to jog for 2 hours – Amount Sandy used to run in the 1st hour

= 13 – 7 ½ (and can be expressed as 7 + ½)

= 13 – (7 + ½)

= 13 – 7 – ½

= 6 – ½ (otherwise expressed as 6/1 – 1/2)

= (6 x 2) – (1 x 1) / 2

= (12) – (1) / 2

= 12 – 1 / 2

= 11/2

= 5 ½

Hence, Sandy ran 5 ½ miles during the second hour.

Based on the above expression, it is observed that there is an element of fractions in the math problem. Also, BODMAS was clearly used to derive the solution to the given question.

Recall, 13 – (7 + ½). The mathematical signs, (–) and (+) were multiplied; one of mathematics rule states that – x + = –; thus 13 – 7 – ½

Notably, fractions deal with denominators and numerators; and in these questions, with the help of BODMAS, they (6/1 – 1/2) were used to factor each other out to derive the final answer 5 ½.

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