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The value of (sin 2 15 +sin 230 +sin 245 +sin2 60+sin 275.)

 sin2 15 + sin2 30 + sin2 45 + sin2 60 + sin2 75

sin2(90 - 75) + sin2(90- 60) + sin2 45 + sin2 60 + sin2 75

cos2 75 +cos2 60 + sin2 45 + sin2 60 + sin2 75

1 + 1 + 1/2

2 + 2 + 1/2

5/2 ans...

  • -2
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 sin2 15 + sin2 30 + sin2 45 + sin2 60 + sin2 75

sin2(90 - 75) + sin2(90- 60) + sin2 45 + sin2 60 + sin2 75

 

The value of (sin 2 15 +sin 230 +sin 245 +sin2 60+sin 275.)

cos2 75 +cos2 60 + sin2 45 + sin2 60 + sin2 75

1 + 1 + 1/2

2 + 2 + 1/2

5/2 ans...

  • 4
A metallic disc is being heated. Its area at any time t is given by A = 5t2 + 4t + 8.
Calculate rate of increase in area at t = 3s. (1) 30 m2 /s (2) 34 m2 /s (3) 28 m2 /s (4) 20 m2 /s
rate of increase of area , dA/dt = d(5t2+4t+8)/dt
  = (10t +4)
So rate of increase of area i.e. areal velocity = (10t +4) where t is in seconds
  • 1
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