prove that Sin 20° cos 25° + cos 20° Sin 25=1/√2
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Step-by-step explanation:
f sinθ=725 , find the values of cosθ and tanθ. ... ∴sinθ+cosθsecθ+cosecθ=sin45°+cos45° sec45°+cosec45°=1√2+1√2√2+√2= ... (9) If tanθ+1tanθ=2, then show that tan2θ+1tan2θ=2
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Answer:
=> sin 20 cos 25 + cos 20 sin25 = 1/√2
=> sin (90-70) = 25 + cos (90-70) sin = 1/√2
=> cos 70 cos 25 + sin 70 sin 25 = 1/√2
=> cos (70-25) = 1/√2
=> cos 45= 1/√2
=> 1/√2 = 1/√2
LHS = RHS.......... proved
this is your answer friends.......... Salmønpanna
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