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2 years ago

(1-cos^2 60°)+(1-sin^2 60°)=tan^2 60°

Mathematics

1 answer:

Aloiza [94]2 years ago

7 0

(1-cos^2 60°)= sin^2 60°
(1-sin^2 60°) = cos^2 60°
Sin^2 60° + cos^2 60°= tan^2 60°

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Answer:

Option (3)

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From the picture attached,

Bar graph sketched shows the grades earned by the students in an exam.

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Option (1)

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= $\frac{5}{45}$

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Option (2)

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= $\frac{17}{45}\times 100$

= 37.78%

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= $\frac{14}{45}\times 100$

= 31.11%

Difference in percentage = 37.78 - 31.11

= 6.67%

Therefore, this option is not correct.

Option (3)

"20% of the students earned a D"

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= $\frac{9}{45}\times 100$

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Option (3) is the correct option.

Option (4)

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(1-cos^2 60°)+(1-sin^2 60°)=tan^2 60°​

(1-cos^2 60°)+(1-sin^2 60°)=tan^2 60°