sin 58 degree sin 13 degree + cos 58 degree cos 13 degree
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Sin(90-a)=cos a---------(1)
Cos (90-a)= sin a-------(2)&
Sec a= 1/cos a
Also we'll use the value of standard angle cosec30 I.e 2
Sin(90–25)/cos 25 +cos(90–58)/sin 58 -sin(90–62) × 1/cos 62 +cosec²30 —(1&2)
Cos25/cos 25 + sin58/sin58 -cos62/cos62 +4(standard angle cosec²30=2²=4)
1+1–1+4
Cos (90-a)= sin a-------(2)&
Sec a= 1/cos a
Also we'll use the value of standard angle cosec30 I.e 2
Sin(90–25)/cos 25 +cos(90–58)/sin 58 -sin(90–62) × 1/cos 62 +cosec²30 —(1&2)
Cos25/cos 25 + sin58/sin58 -cos62/cos62 +4(standard angle cosec²30=2²=4)
1+1–1+4
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0.52991926521415 / this is the right i took a test on this and made a 100
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