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[" 18."(1+cot A-cosec A)(1+cot^(2)A+7],[...

[" 18."(1+cot A-cosec A)(1+cot^(2)A+7],[" 19."(sin A+cosec A)^(2)+(cos A+sec A)^(2)=tan^(2)A+cos theta],[" is "1]

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(sin A+cosec A)^(2)+(cos A+sec A)^(2)=7+tan^(2)A+cot^(2)A

Prove that (sin A +cosec A) ^(2) +(cos A +sec A) ^(2) =7+ tan ^(2) A +cot ^(2) A

Prove that (sin A +cosec A) ^(2) +(cos A +sec A) ^(2) =7+ tan ^(2) A +cot ^(2) A

Prove that (sin A +cosec A) ^(2) +(cos A +sec A) ^(2) =7+ tan ^(2) A +cot ^(2) A

Prove that (sin A +cosec A) ^(2) +(cos A +sec A) ^(2) =7+ tan ^(2) A +cot ^(2) A

Prove that ( sin A+ cosec A)^2+(cos A+sec A)^2=7+tan^2 A+ cot^2 A .

( sin A + cosec A ) ^ 2 + ( cos A + sec A) ^ 2 = 7 + tan ^ 2 A + cot ^ 2 A

7. (sin A+cos A)(cot A+tan A)=sec A+cosec A

(1 + cot A — cosec A) (1 + tan A + sec A) = 2 .