Find the value of sine 15 degree × sine 75 degree ?
PIUS RANJAN PADHI , 7 Years ago
Grade 11
Trigonometry> Find the value of sine 15 degree × sine 7...
1 Answers
yathartha gupta
Last Activity: 7 Years ago
= 2/2sin15×sin75= 1/2[cos(15+75)-cos(75-15)]= 1/2[cos90-cos60]= 1/2[0-1/2]= -1/4~~~~~~~~~~~~~~~~~~~ANSWER
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