The value of 3cosec20∘−sec20∘ is equal to
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Prove that cos12π−sin12π=21
If sinθ1−sinθ2=a and cosθ1−cosθ2=b, then
The value of tan75o=223+1.
If 1o=α radians, then the approximate value of cos(60o1′) is
If tanA−tanB=x,cotB−cotA=y and(sec(A−B)−1)(sec(A−B)+1)= (x+y)cxayb, then find the value of a+b+c.
cos2θ3−4sin2θ is equal to
(1+secθ)2tan2θ is equal to
Express sin3A+sin3B+sin3C as the product of three trigonometrical ratios where A, B, C are the angles of a triangle. If the given expression be zero, then at least one angle of the triangle is 60o