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[" 73."sec^(4)A(1-sin^(4)A)-2tan^(2)A=1]...

[" 73."sec^(4)A(1-sin^(4)A)-2tan^(2)A=1],[" Fe "(1+cot A+tan A)(sin A-cos A)=(sec)/(cos e)]

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Prove: sec^(4)A(1-sin^(4)A)-2tan^(2)A=1

Prove: sec^4A(1-sin^4A)-2tan^2A=1

Prove: sec^4A(1-sin^4A)-2tan^2A=1

Prove that: sec^4A(1-sin^4A) -2 tan^2A=1 .

(1 + cot A + tan A) (sin A-cos A) = sin A tan A-cot A cos A

prove that sec^4 A(1-sin^4 A) - 2tan^2 A = 1.

(1+tan A)/(sin A)+(1+cot A)/(cos A)=2(sec A+cosec A)

sin A(1+tan A)+cos A(1+cot A)=sec A+cos ecA

sin A(1+tan A)+cos A(1+cot A)=sec A+cosec A

Show that (i) sin^(8)A-cos^(8)A=(sin^(2)A-cos^(2)A)(1-2sin^(2)A.cos^(2)A) (ii) (1)/(sec A-tan A)-(1)/(cos A)=(1)/(cos A)-(1)/(sec A + tan A)