p { margin-bottom: 0.25cm; line-height: 120%; } If sin2 θ +sin2 ф =a, cos2 θ +cos2 ф =b, tan2 θtan 2 ф =c;prove that (1+c)/(1-c)=(a 2 +b 2 )/2b,c not equal to 1.

p { margin-bottom: 0.25cm; line-height: 120%; } If sin2 θ +sin2 ф =a,

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