All highlighted sums please
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question 16 a+b+c+=180 by sum property
b+c=180-a
b+c= 180-a
2. 2
sin(b+c) sum (90-a )
2. 2
sin (b+c) (cos a)
2. 2 hence prove
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b+c=180-a
b+c= 180-a
2. 2
sin(b+c) sum (90-a )
2. 2
sin (b+c) (cos a)
2. 2 hence prove
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question12
tan1°.tan2°.tan3°...................tan89°
tan1°.tan2°.tan3°.........tan87°.tan88°.tan89°
tan1°.tan2°.tan3°.....tan(90°-3°).tan(90°-2°).tan((90°-1°)
tan1°.tan2°.tan3°.....cot3°.cot2°.cot3°
=1
tan1°.tan2°.tan3°...................tan89°
tan1°.tan2°.tan3°.........tan87°.tan88°.tan89°
tan1°.tan2°.tan3°.....tan(90°-3°).tan(90°-2°).tan((90°-1°)
tan1°.tan2°.tan3°.....cot3°.cot2°.cot3°
=1
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