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Q:

$$ sin^2 5° + sin^2 10°+sin^2 15°+.....sin^2 85°+sin^2 90°$$ is equal to

  • 1
    $$ {17\over2}$$
  • 2
    $$ {19\over2}$$
  • 3
    $$ {21\over2}$$
  • 4
    $$ {18\over2}$$
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Answer : 2. "$$ {19\over2}$$"

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