WebNov 2, 2005 · Chop235 said: I am stuck on this problem: It tells me to use the Half-Angle Formulas to find the exact value of the trig function. sec ( (15*pi)/8) I know I should convert that into the cos function and when I do I get: cos (8/ (15*pi)) NO! sec x= 1/ (cos (x)) not cos (1/x)! But now I need to find cos (alpha/2) to be able to use the Half-Angle ... WebUsing trigonometry formulas, we can represent the cos pi as: ± √ (1-sin² (pi)) ± 1/√ (1 + tan² (pi)) ± cot (pi)/√ (1 + cot² (pi)) ±√ (cosec² (pi) - 1)/cosec (pi) 1/sec (pi) Note: Since pi lies on the negative x-axis, the final value of cos pi is -1. We can use trigonometric identities to represent cos pi as, -cos (pi - pi) = -cos 0
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WebMar 20, 2016 · cos π 10 cos 2 π 10 cos 4 π 10 cos 8 π 10 cos 16 π 10 Muliplying numerator and denominator by 2 sin π 10, we get 1 2 sin π 10 × 2 sin π 10 cos π 10 cos 2 π 10 cos 4 … WebFind the exact value of the following composite function. sin^{-1} (sin (-pi / {10})) Find the exact value of arcsin (sin 2pi/3). Find the exact value of arccos(sin(pi / 2)). Use a trigonometric function to find the exact value of x. Find the exact value. a) \sin(-330^o) \\b) \tan\frac{7\pi}{3} Evaluate d y / d x of y = 4 x sin^-1 x + 4(1 - x^2 ... WebOct 14, 2024 · Unit circle and trig table --> #cos ((10pi)/3) = cos (pi/3 + pi + 2pi) = cos (pi/3 + pi) =# #= - cos pi/3 = - 1/2# teachoo class 11 maths linear inequalities