1.

\frac { 1 - \operatorname { sin } ^ { 2 } 30 ^ { \circ } } { 1 + \operatorname { sin } ^ { 2 } 45 ^ { \circ } } \times \frac { \operatorname { cos } ^ { 2 } 60 ^ { \circ } + \operatorname { cos } ^ { 2 } 30 ^ { \circ } } { \operatorname { cosec } ^ { 2 } 90 ^ { \circ } - \operatorname { cot } ^ { 2 } 90 ^ { \circ } } \div ( \operatorname { sin } 60 ^ { \circ } \operatorname { tan } 30 ^ { \circ } )

Answer»

1-(1/2)² / 1+(1/√2)² * (1/2)²+(1/√2)²/1²-0²

= 1-1/4 / 1+1/2 * 1/4+1/2/1

= 3/4 / 3/2 * 3/4

= 2/4*3/4

= 3/8



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