sin77 Step by step video & image solution for প্রমাণ করো যে sin5^@- sin67^@+ sin77^@- sin139^@+ sin149^@=0 by Maths experts to help you in doubts & scoring excellent. If sin 77 = x, then the value of tan 77 is x √. • Given value of sin 77 is x. • We know that, sin²z + cos²z = 1.
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