trigonometry - Evaluate Cos 65 - Mathematics Stack Exchange
If you are doing Taylor expansions, perhaps just work out the Taylor expansion for cos(65). Alternately, since 65 = 60 + 5, you could use the cosine addition formula to work out cos(60 + …
Solve: $\\cos(\\theta + 25^\\circ) + \\sin(\\theta +65^\\circ) = 1$
2016年3月31日 · Solve, in the interval $0^\circ \leq \theta \leq 360^\circ$, $$\cos(\theta + 25^\circ) + \sin(\theta +65^\circ) = 1$$ I've attempted expanding but reach a point with no common …
trigonometry - How to calculate sin(65) without a calculator ...
2015年2月17日 · $65^\circ$ isn't a nice one, unfortunately: the only constructible angles with natural degree measure are multiples of $3^\circ$. This is a little complicated to prove directly - …
Find the value of the function $cos(\\alpha-\\beta)/2$
2019年7月30日 · Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for …
Sin 75° + cos 65° ను 0° మరియు 45° మధ్యగల విలువల …
2024年6月10日 · Click here 👆 to get an answer to your question ️ sin 75° + cos 65° ను 0° మరియు 45° మధ్యగల విలువల త్రికోణమి
Prove that sin 65° cos 20° − cos 65° sin 20° = 1√2 - Brainly.in
2021年1月18日 · ANSWERsin65 o +cos65 o =sin(45 o +20 o )+cos(45 o +20 o )=sin45 o cos20 o +cos45 o sin20 o +cos45 o cos20 o −sin45 o sin20 o = 2 cos20 Advertisement New questions …
7 Given that tan 25º = a, express each of the following in ... - Brainly
2020年12月8日 · Find an answer to your question 7 Given that tan 25º = a, express each of the following in terms of a.a tan 205b sin 25°С cos 65° HAMZAWAHAJ HAMZAWAHAJ 08.12.2020
Proving the trig identity $\\sin(20^\\circ)\\cos(65^\\circ)-\\cos( 20 ...
Therefore, the $\sin(85)$'s cancel and you're left with $$ \sin(20)\cos(65)-\sin(65)\cos(20)=-\sin(45). $$ By evaluating this directly, you have the value you're looking for. Share Cite
Proving that $\\cos^{-1}\\frac{4}{5}+\\cos
Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their …
One or more than one correct answer type sin 65° + sin 25
2024年12月31日 · Step-by-step explanation: sin 25° cos 65° + cos 25° sin 65° Comparing with the identity: Sin( A + B ) = (Sin A × Cos B + Cos A × Sin B)