Cos^2 5°+ cos^2 15°+ .....+ Cos^2 355°=
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Step-by-step explanation:
( a ) sinô + ha = 2 = ( sine – 1 ) 2 = 0 = sino = 1 + cos20 = 1 – 2sin20 = - 1 . : : sin20 + cos20 = 1 - 1 ... ( a ) x = a coseco – b cote = ( x + b coto )
The value of sin 35*sin 55 - cos 35*cos 55 has to be determined.
Here it is not necessary to know the values of the sine or cosine of 35 or 55.
Instead use the rule: sin a*sin b - cos a*cos b = -cos(a + b)
sin 35*sin 55 - cos 35*cos 55
=> -cos(35 + 55)
=> -cos 90
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