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1-4. If= seco-, lan Uand ), = cosec () + col () 1hen |
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Answer» x = sec φ - tan φy = csc φ + cot φ x = 1/cos φ - sin φ/cos φ= (1 - sin φ)/cos φy = 1/sin φ + cos φ/sin φ= (1 + cos φ)/sin φxy + x - y - 1=(1 - sin φ)/cos φ * (1 + cos φ)/sin φ + (1 - sin φ)/cos φ - (1 + cos φ)/sin φ + 1=[(1 - sin φ)(1 + cos φ)]/(cos φsin φ)+ (sin φ-sin^2 φ- cos φ-cos^2 φ)/(cos φsin φ)+1=(1+cosφ-sin φ-sinφcos φ)/(cos φsin φ) -(sin^2φ+cos^2φ+cos φ-sin φ)/(cos φsin φ)+1=(1+cosφ-sin φ-sinφcos φ - 1- cos φ+ sin φ)/(cos φsin φ) -1=(-sinφcos φ)/(cos φsin φ) +1= -1 + 1= 0 |
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