COS 519 19. The value of sin 39° 70...
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COS 519 19. The value of sin 39° 70 + 2tan 11° tan 31° tan45° tan59° tan79° - 3 (sinº21° + sin?699) is (1) 1 (2) 2 (3)-1 (4) O

11th - 12th Class
Maths
Solution
228
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19. (4) ( frac{sin 39^{circ}}{cos 51^{circ}}+2 tan 11^{circ} cdot tan 31^{circ} ) ( tan 45^{circ} cdot tan 59^{circ} cdot tan 79^{circ}-3 )
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