Question

Find the value of cos15 and tan 15

Answer 1

Answer:

Additionalknowledge

Knowledge about Quadratic equations -

★ Sum of zeros of any quadratic equation is given by ➝ α+β = -b/a

★ Product of zeros of any quadratic equation is given by ➝ αβ = c/a

★ A quadratic equation have 2 roots

★ ax² + bx + c = 0 is the general form of quadratic equation

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Answer 2

Answer:

cos 15 =From the trigonometric identities we know that cos2θ=2cos2θ−1, in this double angle formula if we put θ = 15° then we get cos15° in terms of cos30° hence we can find the value of cos15°.

tan 15 = By the trigonometry formula, we know, Tan (A – B) = (Tan A – Tan B) /(1 + Tan A Tan B) Hence, the value of tan (15°) is √3 – 1/√3 + 1.

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