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Grade: 11
        
if cos250 + sin250 =p, then cos500 is
(A) ∫ 2-p2          (b) – ∫ 2-92     © p ∫ 2-p2  (d)  – p ∫ 2-p2
 
this symbol represent ∫  square root . pl. show the working
one month ago

Answers : (1)

Vikas TU
8825 Points
							
Dear student
Cos25 + Sin25 = K .........1 
Cos2Q = Cos^2Q - Sin^Q 
=> (CosQ+SinQ)(CosQ-SinQ)
Square equation 1 
Cos^25 +Sin^2 25 + 2Cos25*Sin25 = K^2
1+ sin80 = k^2
Sin 80 = k^2 -1 
Draw traingle and apply pythagorus theorem 
Cos 50 = ksqrt(2-k^2)
 
one month ago
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