using trigonometric table , find the value of:
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cos²20°+cos²(90°-20°)
-------------------------------× sin35°sec(90°-35°)
sin²59° + sin²(90°-59°)
cos²20°+sin²20°
-------------------------------× sin35°cosec35°
sin²59° + cos²59°
we know that
sin²A + cos²A =1
therefore
1/1×1 = 1
-------------------------------× sin35°sec(90°-35°)
sin²59° + sin²(90°-59°)
cos²20°+sin²20°
-------------------------------× sin35°cosec35°
sin²59° + cos²59°
we know that
sin²A + cos²A =1
therefore
1/1×1 = 1
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